Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be4be85da7248f0…

MALICIOUS

PDF

64.5 KB Created: 2020-12-26 00:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 33f6af4acdf475462451d1e239295791 SHA-1: b0bae17658baacef17d02b8c575a886162ef864d SHA-256: 5be4be85da7248f0eb496b3db99127e2ecd986a2d37645773a9b4e7c18d7e0e4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL, 'https://trafffi.ru/strik?utm_term=air+raid+siren+sound+effect+youtube', is flagged as an external URI. This suggests the document functions as a link farm designed to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics. No scripts were extracted from this sample.

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://trafffi.ru/strik?utm_term=air+raid+siren+sound+effect+youtube PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447487/normal_5fc93e482d5ae.pdfIn PDF document text
    • https://bififofivajarat.weebly.com/uploads/1/3/4/3/134315789/fatalam.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/4vIjcjb/26813671273.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/tirosefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_5fb60cba8098e.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/ihYifOI/knight_awakening_guide_maplestory_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_5fbb2023494f5.pdfIn PDF document text
    • https://dupuzebor.weebly.com/uploads/1/3/4/6/134639309/9256998.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/5136944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fdc0e485ccb7.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/loranoduzuja/home_carer_tax_credit_form_11.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/14789016581.pdfIn PDF document text
    • https://s3.amazonaws.com/kozikixoju/57320138796.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_off0000c273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC273 5216 bytes
SHA-256: b99ff3a551310245092ba9c56be8b2d01ac991430fac74c3d7f2c38cff0023f3
font_01_sfnt_off0000d448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 9660 bytes
SHA-256: 5786844353de2f405c98528d89f3c39dfdbf11a0d55c1f434821619c8c38d7ac

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