Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7151f225a5de34…

MALICIOUS

PDF

76.3 KB Created: 2021-03-02 01:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 6a03e8b27037b90f13f73c3ebd5538d8 SHA-1: e237ef8703267d4c9ac7a69b108b5cf335b356ce SHA-256: 8f7151f225a5de349b2c84aa6c6a3ebe213a3b201188aae9b9598c41ce766251
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://jacksth.ru/123?utm_term=catia+v5+sketcher+tutorial+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382003/normal_5fc6ba127a61e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426830/normal_5ff8de5bd98ef.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/gfzSFhf/fuzalok.pdfIn PDF document text
    • http://wukifiduputafeb.22web.org/mudulejusofufutuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_6010b376dc568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465537/normal_600c6f56aaa65.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/wuroketo.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/dojasazonaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woranuganavot.myartsonline.com/25006455330.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/voxijotivawobewexujavon.pdfIn PDF document text
    • http://xefivaz.epizy.com/mopoxutezujama.pdfIn PDF document text
    • http://zuputes.atwebpages.com/63108085147.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/63917718173.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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 5396 bytes
SHA-256: 6eaf5f26efbdbc5e4d0605686a60a07d57bb9646975418df46172321de8018bb
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 10928 bytes
SHA-256: 234cd6f85b79dd8648efc8436bcabd26306ece6c49989ca54898d76804a20349

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