Malicious PDF — malware analysis report

Static analysis result for SHA-256 876429e581fb8486…

MALICIOUS

PDF

76.4 KB Created: 2021-02-21 06:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: dc041ad5355917df9e01e7763dcbbade SHA-1: 00c3092d7b94a18fef204fe4797442e39640fcca SHA-256: 876429e581fb84867cbfd777a5cc88365886b9c46b00a9e87992930edc64eb23
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The presence of 'fishing rigs freshwater' in the document body and a related UTM parameter in one URL further supports a phishing lure.

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://jottigo.ru/strik?utm_term=fishing+rigs+freshwater PDF link annotation
    • https://jujowaganul.weebly.com/uploads/1/3/0/8/130874338/feroxegen_najifofebudet_bozefejakoso_laxer.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/milapopimoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_60193777719a3.pdfIn PDF document text
    • https://pugotaba.weebly.com/uploads/1/3/5/3/135302821/vokom-bivomasejamug-tefefulafa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_5fcb349f610e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_6022a8a24679e.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/fnFSZY8/texas_online_calculator_scientific.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/Dgu7tjf/commander_s_intent_definition_army.pdfIn PDF document text
    • https://nivagevap.weebly.com/uploads/1/3/1/4/131438423/jubikowiseb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479439/normal_5fc7531e1df5a.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/EjjgekW/tezatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5fe7742224d86.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/kagedatabujo/business_formation_lawyers_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/adblock_for_opera_windows_7_free.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_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 5044 bytes
SHA-256: c10c1aadd0cccd0ef003436a8b7eee675355b62684e6f98ba987aee5133b341a
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 10784 bytes
SHA-256: f95317fe6669199f619a0d4e153ebd2233cdf4ce5757bf5fac4d539317d27000

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