Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36c879fb571b37e…

MALICIOUS

PDF

64.0 KB Created: 2020-12-30 15:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ffcc96d7d95a512a2c0964e98ab1140 SHA-1: 206e271a09a8cc86d1245030a89e7cbbfb4b164b SHA-256: d36c879fb571b37e6416f55724b0c47b20e44edfd3e9d34801da5f197999e750
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=digital+genius+lab+bbb
    • https://cdn-cms.f-static.net/uploads/4454546/normal_5fd2c687f3ad3.pdf
    • https://cdn-cms.f-static.net/uploads/4391642/normal_5fa93e3e1e473.pdf
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f87289196eb2.pdf
    • https://cdn-cms.f-static.net/uploads/4428043/normal_5fe9363093bc2.pdf
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5fbedd3443213.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/xekena.pdf
    • https://cdn-cms.f-static.net/uploads/4415754/normal_5f94a01915988.pdf
    • https://cdn.sqhk.co/foxinukepo/Digih9c/57779204211.pdf
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5fad946289f0d.pdf
    • https://cdn.sqhk.co/sozovoja/hjgjigC/dekuwofonulenip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/27f67eaa-1135-4e30-b709-c3027a4fd79d/73522678621.pdf
    • https://uploads.strikinglycdn.com/files/6b717540-a415-45c6-8662-23a09ce957c0/xcaret_map.pdf
    • https://uploads.strikinglycdn.com/files/30969c3b-5324-4bbe-9a63-5bbedb25e354/word_dictation_voice_commands.pdf
    • https://uploads.strikinglycdn.com/files/f67ebe49-7f23-452e-80e0-a54d53a5fd60/94955223733.pdf
    • https://uploads.strikinglycdn.com/files/224b006e-4726-475c-9acb-cea14a5fdf28/social_psychology_textbook_9th_edition.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e701.bin
2ab599ed516c77a4f2fb22d8d5f28e78cc934d62c23582375cce37ea3a9f713b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 4896 bytes

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