Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da4fffec71db137…

MALICIOUS

PDF

117.9 KB Created: 2021-09-10 10:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2b66e87629e8e6396f41791ea81ced7a SHA-1: aa0a47605b4a1108567349e078fd0a95c71841aa SHA-256: 1da4fffec71db1378c6a58cda34972b7509eeb7dcf3a364a60f019e800a793a3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment, likely leading to further compromise via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6282

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://pixomot.ru/uplcv?utm_term=aproximaciones+al+estudio+de+la+literatura+hispanica+7th+edition+pdf PDF link annotation
    • http://atomicattack.com/atomic/fckimages/file/47101005102.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/segapasezovat.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/61152134912.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/suwagitulenivolek.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/64206186038.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907062205.pdfIn PDF document text
    • https://asken.as/bilder/file/10866513776.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/41614689791.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/lukibusakexedeledaro.pdfIn PDF document text
    • https://iword.de/userfiles/file/62602377777.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/bivaruluvesixeg.pdfIn PDF document text
    • http://yejida.com/userfiles/file/moxatorizijofuxanekujuvo.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/87242303202.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/b8on9thtaqg3f9qlictk8682vo/2638360954.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jixofivexuregoporiwovo.pdfIn PDF document text

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