Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8da6f5848fd713…

MALICIOUS

PDF

64.0 KB Created: 2021-04-04 17:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b12e232705686aba79aafca73d256f20 SHA-1: 7002c40a40d42e14af8bc4f56bb61b8319c93aca SHA-256: ef8da6f5848fd713fbb8dfd8545f6e6e8c044071787ed70df49db09ce8e3c4cd
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Genie intellicode keypad troubleshooting'. The presence of external URIs and the link farm heuristic indicate a strong likelihood of this document being used for phishing or to redirect to a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=genie+intellicode+keypad+troubleshooting PDF link annotation
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    • http://rollernefritmassage.xyz/37032266047puqip.pdfIn PDF document text
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    • https://cdn.sqhk.co/vumuwilaj/gijiaDx/talking_cat_and_dog_apk_2._0.pdfIn PDF document text
    • http://luxumelo.iblogger.org/criminal_law_books_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885fc8b6-c2ff-427a-880d-6bd33c9c7015/best_knots_for_dyneema.pdfIn PDF document text
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