Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ef4a84fe17a833…

MALICIOUS

PDF

37.6 KB Created: 2021-09-23 15:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 04fc459aa4634749b391ae456a343a72 SHA-1: b94b5b90f5fc394728f7896e17ceb35a41390ca4 SHA-256: e1ef4a84fe17a8337928c604c9e8abaf3411d5c3ce28a3d7fd10bd87a8e0d4df
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, suggesting it's part of a link farm designed to redirect users to potentially malicious sites. The document's structure, being image-heavy with minimal text, further supports its use as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7887

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://medvor.ru/uplcv?utm_term=titan+quest+obb PDF link annotation
    • http://vegman-kzn.com/ckfinder/userfiles/files/49267464735.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/94399177350.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/19759316273.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/vesifafarezolutipu.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/17261026294.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/79042549039.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/81690398452.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/nokinewuwixoko.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/fejozipedoliwedeniwoxufek.pdfIn PDF document text
    • https://krossi.ru/images/content/files/mulorasomepe.pdfIn PDF document text

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