Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff1025af8daebe3…

MALICIOUS

PDF

63.6 KB Created: 2021-09-12 01:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ad6c221ebeea4495def88161a71e19f SHA-1: ca5bc3c417aa636a5071355f11e8f3b60a476dff SHA-256: bff1025af8daebe3459b76d1bf85a8b9ba311e15cea7943b3e797777e39a984e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a redirector likely leading to a phishing or malware download page. The PDF structure and the presence of multiple disposable links suggest a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8321

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=wonder+full+movie+free PDF link annotation
    • http://kapelski.pl/userfiles/file/2763110082.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/bodejesemejexexe.pdfIn PDF document text
    • https://capecoralliving.com/media/file/13643241340.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06cf97e5078fcf3e0c5d5f8c2a9b0917/tupexesapimotana.pdfIn PDF document text
    • http://grimastone.ru/files/gonulo.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/21852764954.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/nolov.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e9672684b---fokotojuzifidobe.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/gifazudima.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/rilafaparejaxepudadiz.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/volis.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/saxoloduju.pdfIn PDF document text

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