Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ec941e0790c3bf…

MALICIOUS

PDF

74.4 KB Created: 2021-02-02 12:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 038d5bc36f59d8d28faace0b7cf8b179 SHA-1: 773997cdae923874a6a86d09cd729495b1a913de SHA-256: 93ec941e0790c3bf2cc5154f3fb1f8e096bd7ee74661a7333b4c6e4be8cbaca9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to numerous external PDF documents. The document body, though heavily obfuscated, contains references to 'Crow tribal court forms' and 'wkhtmltopdf', suggesting a lure for users seeking legal documents. The presence of many external URLs, including one pointing to 'maypoin.ru', indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/123?utm_term=crow+tribal+court+forms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500440/normal_5fdc2d6650b2f.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/jhaDhfp/jaxufufaxobo.pdfIn PDF document text
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/zunufug-wonawupelimaxit-nirulopigurobem-zotagof.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/d8qSus9/kordexa_8_mg.pdfIn PDF document text
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/2fa044de.pdfIn PDF document text
    • http://navaram.online/combi_word_level_15_answer8d8i7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371003/normal_6007efa298b1a.pdfIn PDF document text
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/a169d485eab74.pdfIn PDF document text
    • https://lobejimore.weebly.com/uploads/1/3/1/3/131383478/777224331e.pdfIn PDF document text
    • http://wowit.pro/tibialis_anterior_stretching_exercisesuf3jw.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/kemoviniwul.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/dovigebapekelin-xevunedigeba.pdfIn PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/1674c9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 5164 bytes
SHA-256: c4915d11d793bc8320fd206efb4d30597e08344d2663b359f4bd9fea1d6a0536
font_01_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 10400 bytes
SHA-256: 4029d27cb095c9dee345051c49c2a4e1ddf3187805b43dea60288d66d31ef532

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