Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b93e505bd132726…

MALICIOUS

PDF

75.6 KB Created: 2021-03-31 11:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d6fb267d604c7f891c88dec6fe5fa645 SHA-1: 5ad3576ba0b48c8ab164810dc1972a39f919b13d SHA-256: 2b93e505bd132726bd7dbb8470b1bce0bd550ff5dbce366bf06820b8e45dd269
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded links, with several pointing to disposable domains and employing UTM parameters, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=the+fifth+wave+ending+song PDF link annotation
    • http://ruvogodozipabiv.scienceontheweb.net/pumar.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaluwozez/NiegfiS/word_bliss_all_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_602105d548a3b.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/48444010727.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/fhhy4hg/formula_1_2019_results_teams.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/lasosivibaniraderosodowol.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/5007867593.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/Vnlijpe/84407060759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_6054b9a9ac3a7.pdfIn PDF document text
    • http://gojovujewinunuj.mygamesonline.org/abamectina_bula.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/DUA0Ujh/17364805806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_81553b0fa5824b44be2278139f3240c6.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_e5b562f2f2ca4d86bfa5f73443527712.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosawef/uet_admission_portal_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/how_to_do_the_basic_crochet_stitches.pdfIn PDF document text
    • http://logiweliziweje.onlinewebshop.net/zotamutalufakar.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/59072131186.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_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 5144 bytes
SHA-256: ce6595550db2719668d60293bce4bcdb1e5fdef592659ddada7f1ac77e51595a
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 10952 bytes
SHA-256: 57f4e4e28deb67221b9bb3c9807aa443622bf4bd66c31030fc016010de8fc6c9

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