Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e8c0ff03237c2a…

MALICIOUS

PDF

18.9 KB Created: 2020-04-08 21:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b57fd3d086ca386c8fe17065c4aa321 SHA-1: decd132ab92b4306ea655701f2b8a8d497e862b7 SHA-256: e4e8c0ff03237c2a672325c66a0d8d66be7bcbb695bdc612837977eccc9ed731
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document is identified as an image-only lure, typical for phishing campaigns. It contains numerous external links, with the primary one pointing to a potentially malicious HTML file. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the structure and embedded links suggest a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 18 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://riverbusinessdirectorync.com/uploads/1/3/0/6/130640021/130640021.html#lenovo+g580+dolby+driver+windows+8.1
    • http://janinegoldsworthy.com/uploads/1/3/0/2/130291352/tukasomu.pdf
    • http://dare2dreamagain.com/uploads/1/3/0/6/130604844/bowidavuguxupe_kutuziriw_wajevubaxunere_lizubipasosowe.pdf
    • http://edtechresourcehub.com/uploads/1/3/1/1/131164537/f62305cea38f8.pdf
    • http://essencestyles.org/uploads/1/3/0/3/130323814/juvarud-jodoga-bejesej-nofewetafeso.pdf
    • http://smashvb.com/uploads/1/3/0/4/130435685/9049725.pdf
    • http://hclomnixcommunity.com/uploads/1/3/0/7/130739779/xuxebedex_wibunoloserut.pdf
    • http://bigbearlive.com/uploads/1/3/0/7/130776561/nuwotana.pdf

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