Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6331713528456d3…

MALICIOUS

PDF

63.3 KB Created: 2020-11-26 00:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac46f7262384c2b7e3b39c9f663e4eda SHA-1: 183dd7e5534a1f6506b8a9831c7c8cc1b5cd7fa0 SHA-256: b6331713528456d3200a68d4a56db1a6c9bcea179dad9136739913b9133938fb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://traffnew.ru/123?utm_term=tao+tao+hellcat', is directly associated with the malicious verdict. Another URL, 'https://s3.amazonaws.com/leributafa/vuverunoripadugefi.pdf', is also listed as a primary external link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://traffnew.ru/123?utm_term=tao+tao+hellcat
    • https://cdn-cms.f-static.net/uploads/4446638/normal_5fa87cbc25a6a.pdf
    • https://cdn-cms.f-static.net/uploads/4497687/normal_5fb02cf78dcb2.pdf
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f88fcc4eeabd.pdf
    • https://cdn-cms.f-static.net/uploads/4384318/normal_5fb74cc2ba514.pdf
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/potabezugonawe.pdf
    • https://cdn-cms.f-static.net/uploads/4405641/normal_5f9544576f8d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/leributafa/vuverunoripadugefi.pdf
    • https://uploads.strikinglycdn.com/files/156f8755-1ba8-436d-a019-d08dc59af1c7/2012_mustang_v6_mods.pdf
    • https://s3.amazonaws.com/wiwuxot/coturnix_quail_for_sale_california.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd59.bin
e8fed6455ac0dcbc480e2006dc71740ff57d20253a5b8192d8ac83c954cd5d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD59 4564 bytes
font_01_sfnt_off0000ccd9.bin
3b7f28565b46edf685b4800f9bd4288677eb4adcf7652ba8380a55bf1670614d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 10700 bytes

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