Malicious PDF — malware analysis report

Static analysis result for SHA-256 361c9f246cbe9b9d…

MALICIOUS

PDF

73.5 KB Created: 2021-03-16 05:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ebf447f7e22bf9ac04b36701e5990cb0 SHA-1: f092644424fcc2efd50c22ad3f9ed9dacd0a8d01 SHA-256: 361c9f246cbe9b9d2d13ad8bbb74259116f91abef67882a0080fdc26dd6da3e2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The presence of external URIs suggests the document is designed to redirect users to potentially harmful websites.

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://zajinet.ru/123?utm_term=packtalk+bold+user+guide PDF link annotation
    • http://argo-tourism.com/rupudadufetato0fva.pdfIn PDF document text
    • http://nazhivy.net/kexerajivijaravohwhhm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fd1d429d4ddf.pdfIn PDF document text
    • http://freehookup.xyz/braun_series_3_proskin_3080s_manualiafis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_60146cc4d3dcb.pdfIn PDF document text
    • http://datingsexchat.site/fender_passport_300_pro_partsnny5e.pdfIn PDF document text
    • https://nebekateri.weebly.com/uploads/1/3/1/1/131164314/zivufawino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_60466f6f086ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391893/normal_5fd0853ae564e.pdfIn PDF document text
    • http://fartook.online/how_much_is_a_stihl_3620290k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385206/normal_5fe4edad582c3.pdfIn PDF document text
    • http://euroshopme.site/vuboxujeribetugoranonfjdfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_6022060ab6080.pdfIn PDF document text
    • http://biomaniix.website/23674768775l2eih.pdfIn PDF document text
    • http://poopo.ru/mopuka5p8a.pdfIn PDF document text
    • https://xubesizodumuruk.weebly.com/uploads/1/3/4/7/134703494/pebisojori.pdfIn PDF document text
    • https://latest.cardosystems.com/upIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/langside_primary_school_report.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/62125915317.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/sni_bioplastik.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 5312 bytes
SHA-256: 5f735d8df522710936b9d2c06e8bf559e0acb3f2637bf0d2580d65de7b10bd62
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 10396 bytes
SHA-256: 926014adbbad08bea6a6a897b6447fa337a1446680571ed6fe133db6992c61ae

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