Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd106efce5e1bc1…

MALICIOUS

PDF

73.4 KB Created: 2021-05-11 05:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfb1faae45023750d855fb8aed11558d SHA-1: 96604eb29936750ff1780627997d17435b06acdb SHA-256: fcd106efce5e1bc1b3861376b4e848ac483ee907311b68517c310ef92c0e0b4e
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URIs, with a primary suspicious URL pointing to 'seumenha.ru'. The document's structure and embedded links suggest it is designed to redirect users to potentially harmful websites, likely for credential harvesting or further malware delivery.

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://seumenha.ru/strik?utm_term=how+to+put+quotes+in+a+short+story
    • http://tricitysikhs.com/oral_b_black_1000_crossaction_reviews8px1i.pdf
    • https://cdn-cms.f-static.net/uploads/4367656/normal_60603a84f1e0d.pdf
    • http://rasudilikid.mywebcommunity.org/vaxagorokaduxeraragoxigo.pdf
    • http://winoorama.fun/13375920446sj6xn.pdf
    • http://lufexaxoxak.mygamesonline.org/algebraic_topology_journals.pdf
    • http://gegebafebofad.scienceontheweb.net/41024527584.pdf
    • http://osmosiotzs.fun/66393034909mlpz6.pdf
    • https://cdn-cms.f-static.net/uploads/4488329/normal_605a2a9ce2db4.pdf
    • http://detonic-buy.website/348128308643u4hw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_fc8527774d604b4aa65991970f0a4904.pdf?index=true
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_7cb9bbc085064ddbb8e79af72af98c6c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2ed547f9-4888-4a2b-a519-ff4bdba1134b/92403676135.pdf
    • https://uploads.strikinglycdn.com/files/cf9af500-a919-4fec-91e9-13cbc8c45e7e/varberg_purcell_rigdon_calculus_9th_edition_solutions.pdf
    • https://uploads.strikinglycdn.com/files/8fbf467d-c80a-439b-ba5b-804d9d24edc9/how_to_handle_emotional_abuse_from_wife.pdf
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_089a86c1a8e74816a30fabdb52ab5adc.pdf?index=true
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_9ffce713c37346ea8d6649b1c15a032c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fb1d8bb7-214f-40bc-b6fb-3bd9cd8f74c3/50_gramos_de_harina_cuantos_mililitros_son.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_off0000e2b6.bin
586e1ea8bf7da42c21fc8f29b3219b5ed0c58fd8deb72e91229c2c326c23ff65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 5156 bytes
font_01_sfnt_off0000f454.bin
7e2bf4bb751e788c8f4c6f4fc4a1562ed29c66a7b73abcc0ec2dea39540b5f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 10712 bytes

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