Malicious PDF — malware analysis report

Static analysis result for SHA-256 79931890fd725b10…

MALICIOUS

PDF

69.8 KB Created: 2021-05-11 06:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 280e03fc95d43a6c27e913c22268636e SHA-1: 77e697360f6b9d3b318057097084e82a2c81c82a SHA-256: 79931890fd725b102689cc0d04f703b994ef8717ed586725208ca32d036779ee
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'seumenha.ru/strik' which is flagged as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=summer+infant+banister+%2526+stair+gate+instructions
    • https://static.s123-cdn-static.com/uploads/4412160/normal_5ffd303bdd65e.pdf
    • http://business-open.online/literal_equations_worksheet_3_answer_key6cxn6.pdf
    • http://prostosite.site/pusuminat2eh8.pdf
    • http://the-glow.ru/rudasurigogusim9cbu.pdf
    • http://lotupojaxuvutix.mygamesonline.org/14778284816.pdf
    • http://reawolt.online/how_to_achieve_revenue_targetsacs4y.pdf
    • http://antinomi.design/garena_lol_update_stuck_at_95sxwz9.pdf
    • http://vexoxem.scienceontheweb.net/jodezaneluxazimifene.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://itanah.space/70198094162kmfo4.pdf
    • http://podcard2020.site/gebola81cfg.pdf
    • http://terakusinuw.mypressonline.com/kufegasedume.pdf
    • http://de-bewertung-id-q2e5t23.top/is_dog_lucky_in_2020dh69m.pdf
    • http://helplnstagramcontact6088757.com/4360658749735no.pdf
    • http://latuha.com/luburupogubi4ov.pdf
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5ffc677ace2ee.pdf
    • http://wspring.space/527627454799ivcj.pdf
    • http://sitonuba.mypressonline.com/fitexetakizojagelapapenam.pdf
    • http://ontrade.top/2918596087709vvd.pdf
    • http://mavpa.fun/how_to_learn_woodworking_skillsejc46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tufitijinexu/attivazione_android_auto_fiat_tipo.pdf
    • https://s3.amazonaws.com/zarelusipofox/33877236955.pdf
    • http://muvekalufisu.atwebpages.com/54545096491.pdf
    • https://s3.amazonaws.com/mojivikapeti/manual_de_primeros_auxilios_2020_mxico.pdf
    • https://s3.amazonaws.com/vufupu/asp_net_mvc_5_tutorial_step_by_step_for_beginners.pdf
    • https://s3.amazonaws.com/bepukuba/75666897213.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_off0000d1fb.bin
35770057187cc1298cbc7d9a05f39db7f0df0ead141e5abc3bb89ed4b54f73ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FB 5124 bytes
font_01_sfnt_off0000e34c.bin
9fe8aa8dc0981847e40ed08e1f13e34bfc3fe0d3288958937a9f395e80011c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 11404 bytes

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