Malicious PDF — malware analysis report

Static analysis result for SHA-256 26306b03a864d844…

MALICIOUS

PDF

81.4 KB Created: 2021-06-03 23:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7fa081e540a3d47af4198ed87ec53bc SHA-1: 7ff9f64b6d64697331e21e2dedccf5a7ab93e51b SHA-256: 26306b03a864d844117219147128f9566b2f8b578ec4efd8181dc26d636f08d7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pistant.ru/pbw?utm_term=what+is+a+de9c+form
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5fdc2a2127dc9.pdf
    • https://cdn-cms.f-static.net/uploads/4469359/normal_6066b9470d615.pdf
    • https://cdn-cms.f-static.net/uploads/4475380/normal_6033d0960ec27.pdf
    • https://static.s123-cdn-static.com/uploads/4419650/normal_5ff44d4b67056.pdf
    • https://static.s123-cdn-static-d.com/uploads/4390057/normal_60affd300b3aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fepewuwakow.pbworks.com/f/xijit.pdf
    • http://fixiguru.pbworks.com/f/how_do_you_copy_from_a_protected_excel_sheet_without_password.pdf
    • https://uploads.strikinglycdn.com/files/7bf6731b-31a3-4bcb-bae3-2bf557d8e64f/gigijetus.pdf
    • http://vowujepojez.pbworks.com/f/how_to_get_axes_in_lumber_tycoon_2_2021.pdf
    • http://guronavageba.pbworks.com/f/38900913971.pdf
    • http://tufukamapaf.pbworks.com/w/file/fetch/144499029/ejercicios_de_programacion_lineal_entera_mixta_resueltos.pdf
    • http://zogekinovag.pbworks.com/f/wipipumobalidag.pdf
    • https://uploads.strikinglycdn.com/files/c74b436f-fa83-475a-8e68-2707a23d20d2/what_are_the_symptoms_of_communicable_diseases.pdf
    • http://xetibubib.pbworks.com/w/file/fetch/144411609/68024656535.pdf
    • http://bukafag.pbworks.com/w/file/fetch/144514200/p6_eppm_user_guide.pdf
    • http://pagorevet.pbworks.com/w/file/fetch/144448125/the_milkman_of_india_questions_and_answers_class_7.pdf
    • http://pukagij.pbworks.com/w/file/fetch/144471324/gudetama_tamagotchi_instructions_english.pdf
    • http://nitezug.pbworks.com/w/file/fetch/144567396/14921287687.pdf
    • https://uploads.strikinglycdn.com/files/16420f7f-4464-4f64-b336-544c69e5f732/the_7-day_flat-belly_tea_cleanse.pdf
    • http://xuresasadox.pbworks.com/f/samejomejafufowumuwosix.pdf
    • http://jilawuxifi.pbworks.com/w/file/fetch/144551448/ziriwaxubonikeva.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f432.bin
8f0f677216abdb4de07024e51c12b3a6c2db51ec4303348313b4aefacb0c8ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 5080 bytes
font_01_sfnt_off0001057a.bin
8dfe0bce92d585ede093553838cf98977d3dfe8f6e210954816b1fd52bb81369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 10260 bytes
font_02_sfnt_off000128a9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128A9 4324 bytes

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