Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c29f5a29a5c1d73…

MALICIOUS

PDF

37.6 KB Created: 2021-09-07 17:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94d8a5b955211137f91473332fee698e SHA-1: 96f72604cb0669a4195a1d14ce4f01d072a88b92 SHA-256: 4c29f5a29a5c1d73af800322391f321154d70977c91cf4de22e212e1b7e36020
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, suggesting it's designed to trick users into clicking an embedded link. The presence of multiple external URIs, some with UTM parameters, indicates a likely attempt to redirect users to malicious websites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9643

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://ketchas.ru/uplcv?utm_term=minutes+of+meeting+report+sample+pdf PDF link annotation
    • http://challendor.com/fckeditor/upload/file/4367811380.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/rewojadu.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/42400672726.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/wawar.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/60202328968.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/27443116342.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/hk85rto1gq9edjrubqeblim788/11288593519.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/93493577316.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/vujoni.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/76454379748In PDF document text

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