Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe7bd316fc0d0ee…

MALICIOUS

PDF

74.8 KB Created: 2021-02-23 02:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 009387e5260ad4953e3fbff5a4af1bc6 SHA-1: 5e2407d9028a009cae46f4d90abe50dbbf3f7e8e SHA-256: 3fe7bd316fc0d0eeea163bc66d4233a95237c0163fe9dce7357de11441e0458a
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains. The document body, though heavily obfuscated, suggests a lure related to a 'Hamlet' study guide, likely intended to trick users into downloading a secondary payload.

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://druttle.ru/123?utm_term=hamlet+act+2+and+3+study+guide PDF link annotation
    • https://cdn.sqhk.co/kigaratak/D7jbif9/prehistoric_animals_found.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421960/normal_6031dfb175c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_600be6f36cef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_601f8e4b075e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_600aad2c657e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5fdd95d03ad5b.pdfIn PDF document text
    • http://anyita.space/913985119990q8n2.pdfIn PDF document text
    • http://kutalevewomem.22web.org/plutarch_moralia_summary.pdfIn PDF document text
    • http://wisecredit.info/why_does_my_pressure_washer_stop_runningbd5ak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5ff316d771652.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/HjjJEgf/winiwimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5fdc26f1e3744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_602b976668993.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafolizol.rf.gd/chirunavvula_chirujallu_movie_movierulz.pdfIn PDF document text
    • http://wexaxota.epizy.com/45815747447.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_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 5524 bytes
SHA-256: a39c01b342dc0ce2c48b8630eb0276ab480c05d0d40a3e27e6c69f5ed9699ac4
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 10228 bytes
SHA-256: 01dfec45e8933face76b0b95c72b6ddfe0f1fa7608ab0ff5398290c64c903ff3

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