Malicious PDF — malware analysis report

Static analysis result for SHA-256 79df4cf7cba27d49…

MALICIOUS

PDF

78.7 KB Created: 2021-04-02 01:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad68b6abc33d4b5ae3255d5b148ff104 SHA-1: 9a05c5b4e53c754956aa2a96dcb52ffd6df65eb6 SHA-256: 79df4cf7cba27d49be70e9ba656306928d0e72a8f588304dd218a3e190c96b73
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, contains keywords related to 'horse racing calendar' and 'wkhtmltopdf', suggesting a lure to disguise the malicious URL.

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://dafemum.ru/award?keyword=malaysia+horse+racing+calendar+2020+pdf
    • https://degovemidim.weebly.com/uploads/1/3/4/0/134017519/demajulenuj.pdf
    • http://soul-felt.com/fledgling_octavia_butler_summaryl994z.pdf
    • https://cdn-cms.f-static.net/uploads/4500679/normal_605d80a23a867.pdf
    • http://prizinsta.site/balumugexate566fn.pdf
    • https://cdn-cms.f-static.net/uploads/4402936/normal_6044d9215681f.pdf
    • http://silewugebed.scienceontheweb.net/35685124324.pdf
    • https://cdn-cms.f-static.net/uploads/4367312/normal_606521bddf722.pdf
    • https://pusurezifokuni.weebly.com/uploads/1/3/4/3/134317864/88246f71627.pdf
    • http://zonizubiro.getenjoyment.net/carbohydrates_biochemistry.pdf
    • http://xeeewq.xyz/i_pilot_trolling_motor_12vjsktj.pdf
    • http://yourlivehelp.com/vegolitiriwa25f.pdf
    • https://cdn-cms.f-static.net/uploads/4413719/normal_6012abce549a5.pdf
    • https://mivewuwadomabat.weebly.com/uploads/1/3/1/6/131606259/706601.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fogibi/vanro_anarchy_online.pdf
    • https://s3.amazonaws.com/titugome/when_does_the_stock_exchange_close_today.pdf
    • https://s3.amazonaws.com/towutoginadivu/bansuri_tune_free.pdf
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_ae516066be8d47d682e80e9f4239c546.pdf?index=true
    • https://4f0f5a39-0a2f-4cdf-b4e4-40a644fad8b9.filesusr.com/ugd/2024fe_8fcb627be1d24050a9db64f40be23e32.pdf?index=true
    • https://s3.amazonaws.com/rozebofukixus/medimatamokigexap.pdf
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_ae36acbe3b0346e3ac52e8851dd92838.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d2.bin
a700590ac0ffb46054321d05ffceba442316e37e0d292948b4d6f1c73cd13ecb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 5796 bytes
font_01_sfnt_off000105a2.bin
b17582d7755bc38165f88b97312fd841a6b99dbd3c2aa96c94cce0daf1d37a75
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 11228 bytes