Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe85f6f2439489c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-27 14:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3545a45da2d1b2103473946fdb39493c SHA-1: 94dffb5cceda88c0b4a9d766ab6800da5b9b2da9 SHA-256: ffe85f6f2439489c00f259b55cc581639ebf4f1759e9e1b0482f3ef18fc49ecd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, with the primary URL being 'https://ponafet.ru/strik?utm_term=active+release+technique+courses+australia'. This suggests a malicious intent to redirect users to potentially harmful content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://ponafet.ru/strik?utm_term=active+release+technique+courses+australia
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/dapexelo.pdf
    • https://besuweleterum.weebly.com/uploads/1/3/2/8/132814030/mexaxinetoje.pdf
    • https://static.s123-cdn-static.com/uploads/4465704/normal_5fc5cb2e1202a.pdf
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/vosejirafexorer.pdf
    • http://evakuator-uga.ru/80845304971pvc4k.pdf
    • https://poxopamit.weebly.com/uploads/1/3/4/7/134751622/a4f3a3580.pdf
    • https://static.s123-cdn-static.com/uploads/4449602/normal_5ff9287d14897.pdf
    • https://cdn-cms.f-static.net/uploads/4382784/normal_604cebd41ae23.pdf
    • https://static.s123-cdn-static.com/uploads/4427498/normal_6008367381bed.pdf
    • https://cdn-cms.f-static.net/uploads/4411700/normal_6029e9544b34e.pdf
    • https://wulukisogexoz.weebly.com/uploads/1/3/1/4/131438059/pujutibujur_xemoxidigibab_waguv.pdf
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5fefcfc16afac.pdf
    • https://cdn-cms.f-static.net/uploads/4501212/normal_603b2a7396021.pdf
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/b04173bc6876aa8.pdf
    • https://static.s123-cdn-static.com/uploads/4469386/normal_5ff56b4a1b1c1.pdf
    • http://volosaty100.xyz/20088227910tbiv8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9d7ae31b-6c87-4fb8-a08a-a8ee78fbd4ad/omnitech_shredder_repair.pdf
    • https://uploads.strikinglycdn.com/files/2779ddaf-a4f7-4408-b24b-14ad01af7819/77738340884.pdf
    • https://uploads.strikinglycdn.com/files/7d207c72-e8b2-4cad-b6cf-4dd40c003885/teravidaxediwuru.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_off0000eb79.bin
7fd2b9cf39425a5d1dd22bd3f8d2a8b5336fbd9f83ab10248e108288ced26f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 5064 bytes
font_01_sfnt_off0000fcb4.bin
08bffbf16a95f1dcb3e17f32bcc6bee8b38aa9fa07dbc7a8f2b6060c073cace8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 11456 bytes

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