Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5c76b084823c92…

MALICIOUS

PDF

74.5 KB Created: 2021-03-03 20:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 838ce75c24b8d1b823948bc4c3ac37dc SHA-1: caf1782bc90ec693be002c836e95adfc203587d9 SHA-256: dc5c76b084823c920d33fa571950c9ebc55dc5d0e12b1e4a69edbe7fee5ee898
104 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The presence of an external URI pointing to 'baarspo.ru' and multiple other unknown PDF URLs suggests an attempt to redirect the user to malicious content or download further payloads. The heuristic 'SE_DOWNLOAD_BUTTON' indicates a lure designed to trick the user into initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=men+of+mathematics PDF link annotation
    • http://kushtanash.ru/90729353475np35v.pdfIn PDF document text
    • http://tabikola.online/29743235666hsp6s.pdfIn PDF document text
    • http://alsamcctv.com/agneepath_picture_videoqfop6.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/5ggggOz/fps_games_xbox_one_free.pdfIn PDF document text
    • http://mikrotikwizard.com/what_is_the_best_app_to_use_for_nyc_subwayzkl6t.pdfIn PDF document text
    • http://kpupnov.pro/torogurie6mkd.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/uqjibji/the_sinner_horror_game_download.pdfIn PDF document text
    • http://begemot.space/76702113540pg4jm.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/tazopaju/waras.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/best_b2b_email_marketing_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/xijotonosif.pdfIn PDF document text
    • http://momugegunimex.rf.gd/21933243163.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/men_s_fashion_gift_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/chrome_beta_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/mozilla_firefox_version_50.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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 5000 bytes
SHA-256: 8ae88aa9f884a9dfb1a8130e08fa4fcde90db9db32492ef0948417ad32ecf719
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 10532 bytes
SHA-256: 1d59847b0b6e4103043320f07604090382d140cb5d692517bed75d31b91e8122

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