Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ca3d1e958a25d1…

MALICIOUS

PDF

94.5 KB Created: 2021-03-18 06:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ebf6b8e9e327e1db20c681aefc26a33 SHA-1: 5387d7d99ac5e4215f7df678cc45c9d0a3c3a29f SHA-256: c2ca3d1e958a25d1617df0a5f9c587c607dba4293ad93c217626da705dd8836d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=honda+rebel+500+for+sale+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376088/normal_602987b0dcebc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457572/normal_600082910df8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500432/normal_5feb164c86582.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/kalsifikasi_plasenta_adalahzvcg8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_5fd33f863f95c.pdfIn PDF document text
    • https://cdn.sqhk.co/malakizojaji/xhhQcgf/juvazuj.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/hhMhj07/aircraft_mechanic_school_mobile_al.pdfIn PDF document text
    • http://wordsidepost.top/sefomuzegiranenusorixaq59lu.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/jfghYpU/academic_performance_indicator_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_604e56535698a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472768/normal_5fc7e70497b8e.pdfIn PDF document text
    • http://lnstagrambusiness.com/74246793046x1sl1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485446/normal_5fefeef8749d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69f7c7ec-f776-4f8b-90c4-e8126cd531e3.filesusr.com/ugd/772020_2493f27c69e14a188a04993ca196ad27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/henri_bergson_memory_and_matter.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/ratodikejisofizog.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_f49d4f62a4274808a6495debb2031034.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/boggler_puzzle_answers.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_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 5420 bytes
SHA-256: c75f725a82bc87f39c446649385e2bf57e074e6a6f5a0a8647df863645839626
font_01_sfnt_off00014477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14477 11840 bytes
SHA-256: b5574cdd043be0bcf1a44f13b7391857bf3460fa706d3452780ef6bd2c9ccb65

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