Malicious PDF — malware analysis report

Static analysis result for SHA-256 7081c582fb114fbf…

MALICIOUS

PDF

65.4 KB Created: 2020-11-24 06:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1fc95bf6b75a6c4658423f19767df54 SHA-1: 4d60e49f961fbc2075bce27b31a802364bc41ff8 SHA-256: 7081c582fb114fbffcfc21b0ef0cfd8705a0d21813040daa7355fbec0ceb24a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicative of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL 'https://trafffi.ru/strik?utm_term=affiche+chaque+jour+compte' is a primary indicator of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/strik?utm_term=affiche+chaque+jour+compte
    • https://getugegifajit.weebly.com/uploads/1/3/4/4/134481189/kegumanali-joridagazunir-riruwoterefelo-vibatelokatesim.pdf
    • https://cdn-cms.f-static.net/uploads/4498678/normal_5fad4637066c3.pdf
    • https://cdn-cms.f-static.net/uploads/4465274/normal_5fa8901c435a3.pdf
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/6146431.pdf
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8ec4241a730.pdf
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f8b3d492ec2d.pdf
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5fa01cd7e6eb8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f92e6c99-3a71-43fe-96da-66011d134320/xuwofogad.pdf
    • https://s3.amazonaws.com/vebogotexaf/dragonflight_anne_mccaffrey.pdf
    • https://uploads.strikinglycdn.com/files/afcf82dc-589b-4528-ae2c-dac3c86c014d/38476524841.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_off0000c0c7.bin
14dd02ede8feceb78f35bb82de6877e48a9b73c568cfe9521307cb2ec0422fd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 5236 bytes
font_01_sfnt_off0000d27d.bin
84ceeac425c38023c1ff1544b07b8fd3b30f8d63091ca57bab1d268aeabcc729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 11956 bytes

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