Malicious PDF — malware analysis report

Static analysis result for SHA-256 451a7b9d803cdfc6…

MALICIOUS

PDF

69.2 KB Created: 2021-02-22 05:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9e915d8e96dd63190a494e7cd940607b SHA-1: 67e82cdd671b3c9995997959bc732432c2821747 SHA-256: 451a7b9d803cdfc6a1ff517a0a5155a64ca77c0af07afe92ddfb3af5dc6c76e4
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or scam attempt. The primary malicious URL identified is https://seumenha.ru/strik, which is likely used to redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/strik?utm_term=nespresso+aeroccino3+milk+frother+directions PDF link annotation
    • https://torimavilok.weebly.com/uploads/1/3/5/9/135984964/ee011bd67.pdfIn PDF document text
    • https://wilumixomili.weebly.com/uploads/1/3/1/4/131483065/sikuvojopozasu-rilozonidoje.pdfIn PDF document text
    • https://vuguwawu.weebly.com/uploads/1/3/0/7/130776175/62b83690119136.pdfIn PDF document text
    • https://mibugekokedepi.weebly.com/uploads/1/3/2/6/132682655/830654.pdfIn PDF document text
    • https://semuvobe.weebly.com/uploads/1/3/0/9/130969465/valoguva.pdfIn PDF document text
    • http://xplaintome.ru/dibugiwobuh.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/eibMNaW/bemuzagufereler.pdfIn PDF document text
    • https://pusuxefemaj.weebly.com/uploads/1/3/4/1/134108889/widiwevagibusiv.pdfIn PDF document text
    • https://konokuvov.weebly.com/uploads/1/3/3/9/133997141/360249.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/zotolowowezodupevok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bagokiko/magistrates_court_sentencing_guidelines_speeding.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/vagunamadap.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/20749582112.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/18505520426.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/vyasaraja_information_in_kannada.pdfIn 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_off0000d051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD051 5592 bytes
SHA-256: 753fa36ab736ba45f8d24345d61b9edd8b8f00962642ee4834405c9a3176df63
font_01_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 10608 bytes
SHA-256: 49a4195b867f62ea7dc9d5c74465e8fd3becd645caa8b2ca91c4fb380ec91521

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