Malicious PDF — malware analysis report

Static analysis result for SHA-256 294f77cf38323315…

MALICIOUS

PDF

72.2 KB Created: 2021-02-17 06:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c17ee1c8a9f0dcfa41705f92a2230ac6 SHA-1: da4965db64869156869cae32de914aa9ac987fa3 SHA-256: 294f77cf38323315224c09f7137c40ee02e74a1f03870500f55334d3033373a1
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm designed to redirect users. The primary URL, 'https://seumenha.ru/strik?utm_term=realtek+hd+audio+driver+windows+10+64+bit+free+download', impersonates a legitimate driver download, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=realtek+hd+audio+driver+windows+10+64+bit+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499282/normal_601bd19e89c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_60266b74813fe.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/oHwLdhh/13126969784.pdfIn PDF document text
    • https://lumevukivejus.weebly.com/uploads/1/3/0/8/130874583/gevotapuxapanuxipu.pdfIn PDF document text
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/setobezogaji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366017/normal_5fc627fc67e61.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/5433532.pdfIn PDF document text
    • http://loruvas.iblogger.org/phpstorm_drupal_live_templates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374376/normal_5fed712a70bfd.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/ha7gjib/16878336495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_60155d56b40a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477162/normal_600d2a4da815f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_601f53493bb43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_600798e165c05.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/fjhrLgc/tevuzeguwaruwe.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/nutanigonu/65613412883.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/1438629148.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/10343328629.pdfIn PDF document text
    • http://sepobifesedapeg.rf.gd/homeschool_weekly_lesson_plan_template.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/42112649360.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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 5792 bytes
SHA-256: 064b5add4029f51d08c7ea80d6f61b9651b3458b505ba792373d4834ead4bf3b
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 10336 bytes
SHA-256: 56f50e582cdcce4b1e884417cfb11e96d73ef017d667690b028497b2cc43de15

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