Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f1e50ca8ea92e9…

MALICIOUS

PDF

77.9 KB Created: 2021-03-17 18:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a80f30cab7b415f17f47960c89dee467 SHA-1: 1a0537cde08617b7e20c56037d49198348f90e21 SHA-256: 81f1e50ca8ea92e9e92879ea2cf0225368ffa3c46b2657df88605a9a9f588361
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a large number of links on low-reputation hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/award?keyword=partidos+politicos+definicion+pdf
    • http://yoga-italy.space/tropic_of_cancer_mapt2v22.pdf
    • http://nezowigivomi.scienceontheweb.net/28636781659.pdf
    • http://rabemedexisubis.mygamesonline.org/bryce_canyon_national_park_map.pdf
    • http://vevaxogejaz.scienceontheweb.net/82853963041.pdf
    • http://wuwudikosegukem.mypressonline.com/16117900851.pdf
    • http://rerubin.space/51425823160vtuvo.pdf
    • http://legendnat.space/musica_gratis_para_celular_androidho9mu.pdf
    • http://gexomafe.mypressonline.com/shark_navigator_swivel_pro_complete_upright_vacuum_nv150.pdf
    • http://jirenaxapibetig.scienceontheweb.net/monster_3.5_mm_extension_cable_walmart.pdf
    • https://cdn.sqhk.co/dimumaneda/iid4ibd/klondike_adventures_energy_cheat_codes.pdf
    • http://xibawolafubiz.getenjoyment.net/19539934905.pdf
    • https://cdn.sqhk.co/lopovekis/i0jiic7/88429116508.pdf
    • http://afracheat2.xyz/77921930122b3z27.pdf
    • http://mon-cmbretagne.com/sap_business_one_accounting_moduleabej3.pdf
    • http://ritegifufefut.scienceontheweb.net/how_to_scan_from_hp_4630_to_computer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/14ff64f2-28db-467e-a535-e7f00f4e0fd4/bulolozovigixigele.pdf
    • https://uploads.strikinglycdn.com/files/912895bc-3a6d-40c4-9306-9fec6ceb0550/cyberpower_pc_front_fan_not_working.pdf
    • https://s3.amazonaws.com/zewimu/dilixejejesiwananabi.pdf
    • https://uploads.strikinglycdn.com/files/3cad06d3-452f-404f-8282-704cd4c94a9d/saluwosupubix.pdf
    • https://s3.amazonaws.com/xamapebonijos/wimuluxedita.pdf
    • http://gujimosodaza.myartsonline.com/wavekasonawebumezugobemo.pdf
    • https://s3.amazonaws.com/susonanezaj/47248837770.pdf
    • https://s3.amazonaws.com/gazijewevan/scratch_2_telecharger_android.pdf
    • https://uploads.strikinglycdn.com/files/0ac817af-971e-4197-b495-d3d27f5a8bd6/jawetidowagokopidafu.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_off0000f0b4.bin
126f51e272bead173ef57a2df6aa0e684cfc33dc0072efa77accfb0b0cae3c6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 5152 bytes
font_01_sfnt_off00010247.bin
02ccc348f92c06e8a22f4526afe85d8464725b9fe22f49d46de550421fe9dc08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 11796 bytes

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