Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3891c02843e835…

MALICIOUS

PDF

74.1 KB Created: 2020-12-19 13:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd37d8e7db5ecf38515dddaaa6f388e9 SHA-1: 75bd1829f6fb289c55fa2aa8565f63e7690dc2c8 SHA-256: 6c3891c02843e835702bb9feed41259b62e0373204760bbdd2a6327109c44b0e
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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
  • 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://traffking.ru/123?utm_term=sif4+intermolecular+forces
    • https://zalinojawovuga.weebly.com/uploads/1/3/4/8/134886974/belefubakupulese.pdf
    • https://cdn-cms.f-static.net/uploads/4496380/normal_5fdafcf9153f8.pdf
    • https://gipadakox.weebly.com/uploads/1/3/4/8/134884067/6491286.pdf
    • https://jugijivarute.weebly.com/uploads/1/3/4/6/134620481/virakezusewuj.pdf
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/7258178.pdf
    • https://cdn-cms.f-static.net/uploads/4471719/normal_5fbd538823a9b.pdf
    • https://static.s123-cdn-static.com/uploads/4495065/normal_5fca12a8e09a4.pdf
    • https://static.s123-cdn-static.com/uploads/4367617/normal_5fcbcc7ed08d9.pdf
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f8bce7a41a0e.pdf
    • https://xomadugazulu.weebly.com/uploads/1/3/4/5/134597447/xelul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc7b538feeefa0c0b63a799/t/5fcd59f724c49707d3307f78/1607293435867/pathfinder_kingmaker_knife_master_arcane_trickster.pdf
    • https://static1.squarespace.com/static/5fc53c1cf7cf8c7540473628/t/5fcd52aa05ddc9599d313f1c/1607291564388/ludo_star_2_online_download.pdf
    • https://uploads.strikinglycdn.com/files/2483290a-2d6c-416a-a31f-9664036b6883/lizumisibowoso.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb6.bin
e22eabdc8293203ab62c1c8b56a68c9753fce5af362202c817b8238c8ffa9d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB6 5220 bytes
font_01_sfnt_off0000df64.bin
aa05191a857de4e9fca0909674813f0762cab0b2ba8f6f4e341e376300d4c03f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 11320 bytes
font_02_sfnt_off0001063e.bin
a1bdc24ec6dc0332449754d26803ee00bb6717469f64a18f47c680e22104396b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 16080 bytes

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