Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef849c89b9a2328c…

MALICIOUS

PDF

82.5 KB Created: 2021-04-02 03:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c0ca94a384c7de5e72069c6470511011 SHA-1: 6a4ba3e991f8d0fb8f7d4ef87f2d53fb6c3dd5f2 SHA-256: ef849c89b9a2328ca392988feb7b83617d5fb56e52f7014744587a041918a3d6
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains embedded URLs that likely lead to malicious sites, with one prominent URL being https://mezovuduw.ru/strik. The document body, though heavily obfuscated, suggests a lure related to 'pdf biofloc fish farming' to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://mezovuduw.ru/strik?utm_term=pdf+biofloc+fish+farming PDF link annotation
    • http://kizunawinim.getenjoyment.net/chair_design_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_5fe8c38838714.pdfIn PDF document text
    • https://cdn.sqhk.co/fokodusi/lgqhjhg/16464898773.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/shark_professional_slim_steam_mop_pads.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_605dd97d29960.pdfIn PDF document text
    • https://cdn.sqhk.co/logenuzupug/jijiegh/lopal.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/aibijhe/pugiraxufulegazuzifem.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/agcOgd1/buvofovelivonol.pdfIn PDF document text
    • https://cdn.sqhk.co/zofukumane/YhfteqW/kujakegifigipafutibasod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_601702c6748e2.pdfIn PDF document text
    • https://cdn.sqhk.co/marebilan/fhdjeib/86917059504.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_600274db5c426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493916/normal_6053bec7d3c6b.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/minaxigevani/how_to_cook_waffles_in_waffle_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/80184343984.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/35717166764.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/how_to_do_radioactive_decay_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/user_acceptance_test_software_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/latest_nora_roberts_book_2019.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_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 5576 bytes
SHA-256: f54f3d9e1e1cb09374a9ff5cd362a7ce38516afd778031a0e96bcedfe00cef18
font_01_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 10468 bytes
SHA-256: 48ce5d2fa4b4d4d99866deacc1c5fae517b7cb604d356bd309d006167bd1eafe

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