Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a163a687d30085…

MALICIOUS

PDF

80.0 KB Created: 2021-04-06 11:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b0d0f6f026475618b4f25e17a6d97fd6 SHA-1: f31fb178153d64e65384c88d8e2bd07528b1628b SHA-256: e5a163a687d30085039e2195fce3594e9946a235e4da753ec76f676ccc804bc3
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a network of links. The ClamAV detection and ML classifier output strongly support its malicious nature, likely serving as a lure for users interested in welding blueprints to redirect them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=how+to+read+welding+blueprints PDF link annotation
    • https://cdn.sqhk.co/vumatoxikom/fZUqkjb/nabupufigumip.pdfIn PDF document text
    • https://xisifogobodi.weebly.com/uploads/1/3/4/7/134735845/370493.pdfIn PDF document text
    • https://sisasava.weebly.com/uploads/1/3/0/7/130738988/99589539b5a3a.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/1723370.pdfIn PDF document text
    • https://xumodaniteged.weebly.com/uploads/1/3/4/4/134480563/betixenimi.pdfIn PDF document text
    • https://lugukeku.weebly.com/uploads/1/3/1/4/131407734/gokijapub.pdfIn PDF document text
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/wetaremedidovete.pdfIn PDF document text
    • https://cdn.sqhk.co/jigotove/giEhbjb/31272177344.pdfIn PDF document text
    • https://lupakekurusope.weebly.com/uploads/1/3/4/6/134652685/pewevurijusag.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/bafid.pdfIn PDF document text
    • https://cdn.sqhk.co/tijatabov/ihjgtgj/45735735739.pdfIn PDF document text
    • https://xiresipi.weebly.com/uploads/1/3/1/1/131164504/257af0675f.pdfIn PDF document text
    • https://zawuziwoju.weebly.com/uploads/1/3/1/6/131636930/folebe-deneperu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_0d9d49ab284f49a388c6f6ca87ce2582.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/pikisekuzetir.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_0fb0faaeff034b88ab7b3445e4079b9d.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_e5076004cafa4fcca8446c47c893db15.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_6e15564259f345bd899c5c0cf3cd70b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/26957451300.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/65425636931.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_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 5320 bytes
SHA-256: 75917065b40171edbab9488a9c574fba94f1d10bb9963a5b51af1fe30880ea1f
font_01_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 10492 bytes
SHA-256: 04e6a2bc214a4c24b83418c05a74c4a929d1fc584ec326ab2426fba45f765139

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