misp-modules/misp_modules/modules/expansion/pdf_enrich.py

import json
import binascii
import np
import pdftotext
import io

misperrors = {'error': 'Error'}
mispattributes = {'input': ['attachment'],
                  'output': ['freetext', 'text']}
moduleinfo = {
    'version': '0.1',
    'author': 'Sascha Rommelfangen',
    'description': 'Module to extract freetext from a PDF document.',
    'module-type': ['expansion'],
    'name': 'PDF Enrich',
    'logo': 'pdf.jpg',
    'requirements': ['pdftotext: Python library to extract text from PDF.'],
    'features': 'The module reads the text contained in a PDF document. The result is passed to the freetext import parser so IoCs can be extracted out of it.',
    'references': [],
    'input': 'Attachment attribute containing a PDF document.',
    'output': 'Text and freetext parsed from the document.',
}

moduleconfig = []


def handler(q=False):
    if q is False:
        return False
    q = json.loads(q)
    filename = q['attachment']
    try:
        pdf_array = np.frombuffer(binascii.a2b_base64(q['data']), np.uint8)
    except Exception as e:
        print(e)
        err = "Couldn't fetch attachment (JSON 'data' is empty). Are you using the 'Query enrichment' action?"
        misperrors['error'] = err
        print(err)
        return misperrors

    pdf_file = io.BytesIO(pdf_array)
    try:
        pdf_content = "\n\n".join(pdftotext.PDF(pdf_file))
        return {'results': [{'types': ['freetext'], 'values': pdf_content, 'comment': "PDF-to-text from file " + filename}]}
    except Exception as e:
        print(e)
        err = "Couldn't analyze file as PDF. Error was: " + str(e)
        misperrors['error'] = err
        return misperrors


def introspection():
    return mispattributes


def version():
    moduleinfo['config'] = moduleconfig
    return moduleinfo