Malicious PDF — malware analysis report

Static analysis result for SHA-256 427719ad28df473b…

MALICIOUS

PDF

69.0 KB Created: 2021-02-12 23:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ae4da0d1d2ba2af98b53a5546b0a4e3f SHA-1: ee0658b0138e59b4322aca9ba04db4597be9d61b SHA-256: 427719ad28df473bddc0f42574f9d8c905c9064ce2af6ee9db27fce16275f749
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristic firings reveal it functions as a link farm, containing numerous external URIs pointing to various websites, suggesting a potential phishing or SEO manipulation scheme. The primary URL identified is https://jacksth.ru/wix?keyword=amana+washing+machine+troubleshooting+manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=amana+washing+machine+troubleshooting+manual PDF link annotation
    • https://cdn.sqhk.co/jivonotiso/p5hb9VK/cat_jump_starter_manual.pdfIn PDF document text
    • https://runogobikekeg.weebly.com/uploads/1/3/5/3/135350887/kuses-wunajowisoj-sugikadita-koripig.pdfIn PDF document text
    • https://zejobivajetipud.weebly.com/uploads/1/3/0/7/130740466/1406907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_5fd2c6152a5c1.pdfIn PDF document text
    • https://xiwupezarevapo.weebly.com/uploads/1/3/2/6/132681984/boboko.pdfIn PDF document text
    • https://vagafanuwojuxiv.weebly.com/uploads/1/3/0/7/130776749/doburos.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/9f145f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407085/normal_5ff7e291474d9.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/boradilap_pasaj_kutuwunu.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/tilebinonod.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/bipepezuwed/pukurewot.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_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 5436 bytes
SHA-256: 8d8a748c80cf4311700b1eb24090418265efd91e735ad58b9ace0052d4cb0ea7
font_01_sfnt_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 11680 bytes
SHA-256: 41dcaaea7d975ef1b947e17df8d594b0218aca34633aa585cc5d12bce4e1f990

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