Malicious PDF — malware analysis report

Static analysis result for SHA-256 454b7bc41f657a4a…

MALICIOUS

PDF

76.7 KB Created: 2021-01-31 23:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a991bf9b232007b7825458257e39ba5b SHA-1: d9f306413276f47dbb47ba3d2f387d3cda6e74b0 SHA-256: 454b7bc41f657a4a93de13303ac102ccd1846e5c66c30e49ec46e3dfb362f70f
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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://maypoin.ru/123?utm_term=mini+harley+davidson+chopper+parts
    • http://papotanepif.22web.org/65265872628.pdf
    • http://mezazasakejel.iblogger.org/97618898177.pdf
    • https://static.s123-cdn-static.com/uploads/4368989/normal_5fdeef5425427.pdf
    • http://tajizomekoza.iblogger.org/farmville_3_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4425255/normal_60155af7c7363.pdf
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/b171309b40e1.pdf
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fe036369d4a8.pdf
    • https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/fenowuv_tolelevo_pirakedijizas_rerefi.pdf
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/julajowomexosid-febugogajirob-wakafodin-zilijosobit.pdf
    • https://static.s123-cdn-static.com/uploads/4421767/normal_6000461554059.pdf
    • http://makamar.xyz/renurawinefomon8kjsa.pdf
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/nilakukonurikoxu.pdf
    • http://realnoe-obshenie.online/fafefomijegijuroxega09t8p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tokatefozude/74804638696.pdf
    • https://s3.amazonaws.com/pavujiniz/wodidokixevubi.pdf
    • https://s3.amazonaws.com/votubukaxogilix/butedametigifonuzo.pdf
    • http://jopiwutipav.epizy.com/whatsapp_business_apk_latest_version.pdf
    • http://zunedolu.rf.gd/14833017433.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1c.bin
7b25f346655034894d2936812359ddd1af289ed3a7c3e1a3877963de66a44fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 5328 bytes
font_01_sfnt_off0000fe4d.bin
e05da74ed2f3949d4a3b0ed18e174ea2d9f24e9ceec6fddc116a38eb6bd54c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 11636 bytes

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