Malicious PDF — malware analysis report

Static analysis result for SHA-256 c855eb533015ae40…

MALICIOUS

PDF

73.2 KB Created: 2021-04-05 03:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0c53595ecf7ccde75203092200c16c0 SHA-1: d146571abf61d4bc2a6e331c7d17ac871d1cd30c SHA-256: c855eb533015ae40dd7c1082c25fd9a8394ea027d0f3c4c7ecccde1a96000324
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, and it exhibits heuristics related to browser extension installation lures. The embedded URL `https://pelibifir.ru/strik?utm_term=logicworks+5+free+download` suggests a social engineering tactic to trick users into downloading malicious content. While no scripts were directly extracted, the PDF structure and the nature of the lure indicate potential exploitation for client execution, possibly involving JavaScript.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pelibifir.ru/strik?utm_term=logicworks+5+free+download
    • http://hookup671.site/peer_gynt_suite_no.1_op.46_i._morning_edvard_griegm5psq.pdf
    • http://esclub.pro/100152241259d3pb.pdf
    • http://kovajexikimodu.iblogger.org/alif_lam_mim.pdf
    • http://gdztut.com/fundamentals_of_plant_virologymzw1b.pdf
    • http://kekemubitaf.iblogger.org/manual_de_usuario_bmw_x3_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4443357/normal_602d3b3827724.pdf
    • https://static.s123-cdn-static.com/uploads/4417807/normal_5ff2a3bc279c3.pdf
    • https://cdn.sqhk.co/rogokivika/ha62m7b/war_of_the_worlds_1953_dvd_cover.pdf
    • https://cdn.sqhk.co/sazalevimit/heiijYr/zoxuziwed.pdf
    • https://cdn.sqhk.co/besogevipadi/aZAKhcg/my_boy_gba_emulator_apkpure.pdf
    • https://cdn.sqhk.co/rugofufol/hb0jfaG/monkey_king_tea.pdf
    • https://cdn.sqhk.co/matezafun/iihhUgc/sim_dashboard_ps4_ios.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_8f57618f37344919b644923ed3e47138.pdf?index=true
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_7a430d96a64a464b8eec41accf82f53f.pdf?index=true
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_4c7fa7e303274578ac93e5b346525693.pdf?index=true
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_a1b1bfc5e70647ebb90c7a6f27ec416a.pdf?index=true
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_d4d4a0beebb244439ef18897f28085af.pdf?index=true
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_3b4df138415641888d46226efbe9338b.pdf?index=true
    • https://26b54b0d-7067-4615-bd5a-e9f638bc9197.filesusr.com/ugd/26f5b5_cfd2a108ae124d8d95b3fdde3a41297a.pdf?index=true
    • http://wupenokisu.epizy.com/tupezep.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_off0000e08f.bin
a4bd812e593853fbbf6410e82c5b3c7dfb963f7eebf0bc03f194416962407085		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 5408 bytes
font_01_sfnt_off0000f331.bin
bb740057bdc34ff9e3ab204913e67eea3cfa01d0bfd1e3eb775873dfd98fad2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 10592 bytes

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