Malicious PDF — malware analysis report

Static analysis result for SHA-256 21451508e5669d77…

MALICIOUS

PDF

69.2 KB Created: 2021-06-12 01:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a3e05f3edfd1bc7e305f5af26dd49c90 SHA-1: 3345242f7849cd414c4fe3cd396956dbfd63730d SHA-256: 21451508e5669d776ac922c25e6289f0444e07aee54ee9f351d1cc46e0a31ccd
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. One notable URL, 'https://huntic.ru/pbw?utm_term=how+to+analyze+stocks+fundamental+analysis', is associated with a link farm heuristic, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains strings related to stock analysis, indicating a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8223

Heuristics 4

  • 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
  • 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://huntic.ru/pbw?utm_term=how+to+analyze+stocks+fundamental+analysis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386361/normal_606e82c521c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_60525139c044f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_6028f7c7bc572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_5fd8bee23d5f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_6044e05c57f5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_5ff6b9aa23fe0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373776/normal_5febc8541559c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5fde8f70ca1f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5fc56c0f6fea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483854/normal_60bca86575e13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jubujefaj.pbworks.com/w/file/fetch/145160496/31129059169.pdfIn PDF document text
    • http://gifavipa.pbworks.com/f/65453596386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9a8d32-233a-44be-9494-8a0245574cd0/xezajujepipalim.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/f/35974550263.pdfIn PDF document text
    • http://sedilomodilu.pbworks.com/w/file/fetch/144922851/calculate_enthalpy_of_combustion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390b4c0d-f5cd-4799-9c2c-cbb7fa45ccde/what_is_the_storyline_of_twilight.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/isc2_cap_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc35fb07-baec-4031-8c55-76ea87dd1444/jajifemifujar.pdfIn PDF document text
    • http://doforegapuru.pbworks.com/f/darisavojegap.pdfIn PDF document text
    • http://vasoxekisede.pbworks.com/w/file/fetch/144884088/charlie_malayalam_full_movie_english_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51320d5-e6e6-473a-8828-eb8b0229f70f/nebisubonuxajaxunapuv.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 5340 bytes
SHA-256: f26e6dae49d7614cac50826154e4f1a18a9407e4c84c14ba236d451bfd781e76

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