Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1141f6e1d6f0c67…

MALICIOUS

PDF

78.0 KB Created: 2021-03-21 23:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0b506fc54f0b25defa484ff6d9f84f30 SHA-1: 3b3bbe987a7c0d7dc57277e0670627454d330b97 SHA-256: f1141f6e1d6f0c67b45ed9e0ef63d82baef31797ae2f1b42bab22dddecbb190c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure malicious destinations. The primary URL, 'https://seumenha.ru/strik?utm_term=what+is+the+healthiest+sandwich+to+eat+at+subway', is presented in a way that mimics a search result, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://seumenha.ru/strik?utm_term=what+is+the+healthiest+sandwich+to+eat+at+subway PDF link annotation
    • http://detonicinitalia.website/50813102938mg5fi.pdfIn PDF document text
    • http://kukukoboda.22web.org/go_math_answers_slader.pdfIn PDF document text
    • http://waniwidolo.66ghz.com/accountant_experience_certificate_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/putomikoluku/IijQggr/balerowivarakoxirum.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/49XqBmx/saxesabosuzijiselenumoji.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/cvUTACp/74964736571.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/0iighim/52335733972.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/96560986981y4pir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunojagona.rf.gd/define_sociology_of_education.pdfIn PDF document text
    • http://rexomelozitag.epizy.com/wumagavaxosav.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_b639bfe61b99453fa344913fb76a29a3.pdf?index=trueIn PDF document text
    • http://panobamufa.epizy.com/best_family_portrait_photography_tips.pdfIn PDF document text
    • http://nuvotadaxiti.epizy.com/autocad_3d_notes.pdfIn PDF document text
    • http://povujijizota.epizy.com/72268562203.pdfIn PDF document text
    • http://wuxizajepasuwu.epizy.com/cmc_entrance_exam_question_papers.pdfIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_d7506e4a5ed94e08bcff081495cc3b1c.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_bfe9584ba1b44a8584a5ace2c1d3d4db.pdf?index=trueIn PDF document text
    • http://sujemitusosida.epizy.com/bushwalking_ielts_reading_answers.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_ad2db5bbb6a74c578881c3741156ff67.pdf?index=trueIn PDF document text
    • http://relelefaxup.epizy.com/whirlpool_quiet_partner_ii_noise.pdfIn PDF document text
    • http://bemunaxeje.epizy.com/desebirenuvurujelupumedu.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_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 5276 bytes
SHA-256: 6c4e7e7efdaf5359359ba4223b26404c7ac941a56ca54b4a06ad64b69b6d5132
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 11344 bytes
SHA-256: 6608793f9020a2d8c201e4da0abfd975ea8c87d6202babd68d94faedbba00069

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