Malicious PDF — malware analysis report

Static analysis result for SHA-256 639e56bd71daf6bb…

MALICIOUS

PDF

75.5 KB Created: 2021-03-08 18:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d840f2694180da3aae1420d0ff773fa1 SHA-1: 71c61d94c12265ed2e0c84b6bff9c6682b6d7676 SHA-256: 639e56bd71daf6bb113a9918d6614307bc3afb0a1425134e02d8e37ec08d34f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains references to 'ignou assignment solved free pdf' and numerous external URLs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution lure. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/award?keyword=ignou+assignment+solved+free+pdf PDF link annotation
    • https://luderokuva.weebly.com/uploads/1/3/5/3/135325165/4250709.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/gizexakeke.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/vikuwujulonuzuwuxudisirurop8f.pdfIn PDF document text
    • https://nivosuvadifo.weebly.com/uploads/1/3/5/3/135384950/wonawixufup-tulobexanumovop-julukujomigin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485578/normal_5fe651667afea.pdfIn PDF document text
    • http://getinugalukef.iblogger.org/editable_weekly_lesson_plan_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464873/normal_602088604ab0e.pdfIn PDF document text
    • http://bestcreditcheck.info/amplified_study_bible_freep0g9v.pdfIn PDF document text
    • http://devlp.club/castle_td_2_mod_apk_2018f4vq6.pdfIn PDF document text
    • http://inscarusa.info/what_are_loop_knots_used_for_fishingflh5i.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/1148003.pdfIn PDF document text
    • http://talkme-news.info/89334577843j0qzx.pdfIn PDF document text
    • http://daselefufirapim.iblogger.org/fesuwufubokok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_6022cf423bc24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://potelodifudoduj.epizy.com/animation_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af9ff6c-b904-46e9-97be-1cd8db6a6f34/samsung_galaxy_note_4_user_manual.pdfIn PDF document text
    • http://zomimuju.rf.gd/nojujakip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5619d51-4649-4310-ba11-c2a1aed4f7d5/95757587455.pdfIn PDF document text
    • http://nazedizabif.rf.gd/39685873974.pdfIn PDF document text
    • http://tinanatibora.rf.gd/mendeley_web_importer_not_saving.pdfIn PDF document text
    • http://bupelasupur.epizy.com/lukabolutolotezusekenim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 5360 bytes
SHA-256: ecd918f5ac6c88920553390a3d78e9568acef54c5b4ff2b1f8b2a9cd3082fa3d
font_01_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 10128 bytes
SHA-256: 7639188c9f4d821883f4c6f6270d96630b31660c1aab84a358b06507756e5679
font_02_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 3456 bytes
SHA-256: 8f35ac2fc875442d121498d72616e4c1c874e5916005f4376025e4a3d3640442

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