Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40dd8480834b2af…

MALICIOUS

PDF

72.8 KB Created: 2021-02-12 13:39:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 54ba32ba3d33aeea97fdf16a0a368a6a SHA-1: 721ba40cfc4f70d64783774b0847deed11d352ab SHA-256: f40dd8480834b2af15d3a6c22d916d3c9bd9ac3af656f121c98871407e757894
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically identified as a lure related to 'Section 5.1 organizing the elements answers'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=section+5.1+organizing+the+elements+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407781/normal_60192bfa06698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445333/normal_5fea10ec6b4f2.pdfIn PDF document text
    • http://flowerport.shop/102554678187q28y.pdfIn PDF document text
    • http://yblda.fun/diversity_visa_lottery_2021c3eww.pdfIn PDF document text
    • http://ruzopiter.iblogger.org/ragema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_600ce62668317.pdfIn PDF document text
    • http://keepmaxi.space/super_solano_x_hair_dryerhjd7o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_5fe6c2d090731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5fce939205f9f.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/47127646585x87u7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5feffb5e391a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_601388901ff77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_6025c35257368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461234/normal_5fdbe6c4821dd.pdfIn PDF document text
    • http://copyrightmediahelp.com/shakespeare_playsoiluu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruvedinaz.rf.gd/konixanonimizakarizoxanev.pdfIn PDF document text
    • http://wetavirevamo.epizy.com/71156055193.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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 5664 bytes
SHA-256: 228c8ebdd4e4056a998e9aa1c5af5b5f36979743ace41e2bc2d8d574d6803713
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 11048 bytes
SHA-256: 49d5452e930f93dcba680b31fc13974951ff563d9bc1457fb9fda2a63b74e073

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