Malicious PDF — malware analysis report

Static analysis result for SHA-256 9939f4ab0d10f3d4…

MALICIOUS

PDF

37.3 KB Created: 2021-09-05 13:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9688628a1362a57c2d1f0e1de0fac14c SHA-1: cbd5c1fe87f702aa79f2d7e4b6e18889cea3e2be SHA-256: 9939f4ab0d10f3d46dc06e5740d54c9ce01d0ff688368891300b04c7b3df830c
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide an action trigger. The presence of multiple external URIs, including one with a 'utm_term' parameter, suggests an attempt to redirect users to malicious sites for further exploitation or credential harvesting. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 37 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://oniceh.ru/uplcv?utm_term=fundamentals+of+condensed+matter+physics+cohen+pdf+download PDF link annotation
    • https://transmar.biz/ckfinder/userfiles/files/23668595164.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/53908525466.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/73210062720.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/59713587171.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/58980242890.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/61662940267.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/tojusunotuzixid.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/48941584723.pdfIn PDF document text
    • https://norservis.cz/files/files/8805916189.pdfIn PDF document text

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