Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c955937cc92201…

MALICIOUS

PDF

46.8 KB Created: 2021-09-25 06:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23a6e2f31e071445a4200caf5a160c57 SHA-1: 5043eda4096114dcba559e2af02411cf2a5706be SHA-256: 86c955937cc922016a428a581d03d0a316eed6ff5f2247a7d872f9a66fccf666
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the final destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7173

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 http://toananhmedical.com/uploads/files/68735352683.pdf In PDF document text
    • http://teplorium.su/userfiles/file/wuminonogogozunilef.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4eb9a42df0643cfb1a8bd56ea8339aa6/novazejurine.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/rujozozalokadeli.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/57066738382.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/vedujepamaludedoviram.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/56371516303.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/biweraru.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/wodudezubij.pdfIn PDF document text
    • http://seasplendorpetro.com/userfiles/fovurukudesukizozusopu.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/20779148927.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/xereremukoduti.pdfIn PDF document text
    • http://vaynhe.com/upload/files/jovoretusanezaworip.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f331ac685a---jabom.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/fifomizomonomajelominazuz.pdfIn PDF document text
    • http://e-hematologica.com/users/file/zixatapidugapuj.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/12264107045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=super+mario+1985+romPDF link annotation

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