Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef00aaf80d4f3646…

MALICIOUS

PDF

94.3 KB Created: 2021-04-18 08:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d14cf5fa4692d3af44f68802b4e1cdc5 SHA-1: 28e52c5c8a0b9c5f6a417f73e1de2df1f4d64c01 SHA-256: ef00aaf80d4f364603c16f7195e3459b08caad749f30bb38d934b853b4ddb7bb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic firing. One of these links, https://jacksth.ru/strik?utm_term=snapper+mower+blades+28, is flagged as suspicious. The ML classifier and ClamAV also identified this PDF as malicious, suggesting a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the embedded links points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=snapper+mower+blades+28
    • https://static.s123-cdn-static.com/uploads/4372985/normal_5fcdcffe79e77.pdf
    • https://tenaxujapem.weebly.com/uploads/1/3/4/3/134341928/laxara_pugaroxizeporel.pdf
    • https://kaxesudinebeg.weebly.com/uploads/1/3/1/3/131379803/xemoxepuxiz.pdf
    • https://cdn-cms.f-static.net/uploads/4473656/normal_5fd81dec03be6.pdf
    • https://cdn-cms.f-static.net/uploads/4407998/normal_600c48653d529.pdf
    • https://static.s123-cdn-static.com/uploads/4418583/normal_6008bf96358e7.pdf
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5ffeb4a8ad24d.pdf
    • https://cdn-cms.f-static.net/uploads/4459062/normal_6037ed813cd0c.pdf
    • http://dogisutuzise.22web.org/jerusalem_alan_moore_espaol.pdf
    • https://cdn-cms.f-static.net/uploads/4459035/normal_6017b127d2732.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://joxumokuri.epizy.com/51584189991.pdf
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_67afd5faa7b84c85a67d72e75829e784.pdf?index=true
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_14e6c11ab3e042d7b572845d86c66e31.pdf?index=true
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_579e90cb5f9149748dd12c429b814d0b.pdf?index=true
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_6c4634152fdc4da79b614621fcd9c8ab.pdf?index=true
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_dbd9cd75e2474b9bb33fe3c45698e4c4.pdf?index=true
    • http://zixugudarasol.epizy.com/al_quran_arabic_tamil_translation.pdf
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_73b9fdc8307844ffb62c400d51c83096.pdf?index=true
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_0e10af2143734f5ca00e95e1c35cacef.pdf?index=true
    • http://telexupumijev.epizy.com/wipamuvisabi.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_off00013262.bin
7bce4e560be5db4fe562c689a9a2a28ef21348820ebbc0a4110c4dcb4887349c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13262 5764 bytes
font_01_sfnt_off000145ef.bin
b4e87f6f9ddbd6527be12a3d9309bef44b0b4418b4d60367930fbb54c3488b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145EF 11472 bytes

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