Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9b98ede15f4d33…

MALICIOUS

PDF

79.1 KB Created: 2021-04-17 05:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cb29c4dcdaee2a0c51468558e8349e3e SHA-1: a7b7281cbb85e2d9939efea9e28a6b55f23d4743 SHA-256: 5f9b98ede15f4d33a1e1969e257ad2b57ee8f613876390ec536009bdcf725c90
166 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm designed to redirect users. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content likely prompts the user to install a browser extension or update, a common social-engineering tactic. The embedded URLs suggest a phishing or malware distribution attempt, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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=basic+electronics+video+lectures+free+download PDF link annotation
    • https://cdn.sqhk.co/dizoketa/aijjaD3/2204418010.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/majfTjd/lavururulobuw.pdfIn PDF document text
    • http://insuranceautousa.com/batoka1i0uw.pdfIn PDF document text
    • http://ketrovk.xyz/vofilajuve7ey3d.pdfIn PDF document text
    • http://delayikapy.xyz/jitivodebuce82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489263/normal_600928cee994d.pdfIn PDF document text
    • http://fitness1.space/envision_algebra_1_enrichment_answers2idvo.pdfIn PDF document text
    • http://mailedflkf.site/what_time_can_i_start_my_snowblowersnhc6.pdfIn PDF document text
    • http://naturfresh.fun/computer_hardware_engineer_salary_per_month_in_south_africao3lmj.pdfIn PDF document text
    • http://wamuvosuvebupa.iblogger.org/cake_icing_recipe_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5ff77a1f8b355.pdfIn PDF document text
    • http://podarokinsta.online/what_are_the_foundational_beliefs_of_christianitym5w7m.pdfIn PDF document text
    • http://mushygushysayings.com/92292512225r1mn0.pdfIn PDF document text
    • https://cdn.sqhk.co/rovonoset/hmjdA5f/notes_app_for_ipad.pdfIn PDF document text
    • http://megazoni.iblogger.org/acostarse_conjugation_yo_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/backbreaker_football_1._4_2_apk.pdfIn PDF document text
    • http://joxamemi.epizy.com/simple_sublease_agreement_template_ontario.pdfIn PDF document text
    • http://pipimavejolupu.rf.gd/baginizivu.pdfIn PDF document text
    • http://sejabunadonuri.rf.gd/microsoft._net_framework_2._0_offline_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/14229775520.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/ion8650_i_o_expander_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/sentry_safe_wont_unlock_with_code.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_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 5216 bytes
SHA-256: f6d3b38c6a64eb35e01036b78697e03a8f8612caff4fb8f06d0475aa20eb1d86
font_01_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 10832 bytes
SHA-256: f0d49c9e8f032166938a6e7d9706f2a097a0ceb325c9daf876be7c3ee606dcba

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