Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b75e21b3827b04…

MALICIOUS

PDF

70.8 KB Created: 2020-12-02 20:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a86e487ec69f6207af26ce9c1a12e583 SHA-1: 1811df3f5abc13d64f5ad3319e7ce38d1e7bc716 SHA-256: 34b75e21b3827b0490a1fe468632e3d486171d2b2d47b9dd33d3b77e46d6e1cf
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded links, many pointing to disposable hosting or redirectors, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm heuristic indicates a strong intent to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffnew.ru/123?utm_term=sample+letter+of+dissolution+of+llc PDF link annotation
    • https://wiperuzikenod.weebly.com/uploads/1/3/4/6/134694852/1780602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380869/normal_5fadbc218d3a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5fb7352058ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f949b401f9a0.pdfIn PDF document text
    • https://korumarivaz.weebly.com/uploads/1/3/4/5/134506991/65c84a62590bcca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465125/normal_5fc4ef114cf7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5fbe2255e79a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_5fb9995183625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492586/normal_5fb9d53a87c4e.pdfIn PDF document text
    • https://nometoxuf.weebly.com/uploads/1/3/4/2/134266561/toduvumixabeniw_vasolonivevunoj.pdfIn PDF document text
    • https://pijafajabivigin.weebly.com/uploads/1/3/4/6/134635516/xitugibazex.pdfIn PDF document text
    • https://fejilezujew.weebly.com/uploads/1/3/4/3/134340931/c2d4fc7bfe42.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/9282679.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e06b31-804f-49d3-a7d1-ed2d9e5c9263/the_operation_failed_due_to_an_installation_problem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539a9793-ab51-43c6-a815-408f7463934b/st_jude_dream_home_taxes.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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 5404 bytes
SHA-256: e29bc0b7972289655d770b15cfd0209f8d0d4835eed68adc33121cf8a3af0ca0
font_01_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 10576 bytes
SHA-256: 710f00e2c367daff99967ffbddd7bf47479995520123008aa0504d858d87a2f4

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