Malicious PDF — malware analysis report

Static analysis result for SHA-256 9366474e75a68e41…

MALICIOUS

PDF

67.1 KB Created: 2020-11-24 15:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bd94cb0cc52b7ac7a58a103329885cb9 SHA-1: 15c3172620ced31f91605cdcceedcd309b801de9 SHA-256: 9366474e75a68e41d2ef5ed082295425ae91bf0c576b1dedf52d13be8255d799
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets with seemingly benign filenames, but one critical heuristic identified a 'PDF_SEO_LINK_FARM' suggesting a malicious intent to distribute content or redirect users. The presence of an external URI to 'trafftec.ru' further supports this, as it is labeled as unknown. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content within the PDF structure.

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 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.
  • 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://trafftec.ru/strik?utm_term=mini+dv+manuale+italiano PDF link annotation
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/cc6defcfb1c4.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/4032747.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/dobesogum/manual_for_frigidaire_refrigerator_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/mammut_trion_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/kavuki.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/xulasubojisukenige.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/32660750720.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/hidden_fortnite_letters_r.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/iron_man_3_full_movie_download_filmy_jilla.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/58729221533.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/97990497861.pdfIn PDF document text
    • https://s3.amazonaws.com/tipakalif/contractors_management_services_pageland_sc.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/descargar_acordeon_hohner_apk_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/zoxerevuzaxipasivobe.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_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 4760 bytes
SHA-256: 0c2dcbe7b7e2e2d08b6c4e49a937ed9e710adb529b95871f5d15954d2eec9589
font_01_sfnt_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 11180 bytes
SHA-256: f2051d8d846fc6c3ba7b05d90ab1a02a3d72e6a12b1fd95cc80fdcc658cdf1dc

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