Malicious PDF — malware analysis report

Static analysis result for SHA-256 56223c34280bbc4f…

MALICIOUS

PDF

73.3 KB Created: 2020-12-19 22:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfa272940997f87211f3461c73d00dd7 SHA-1: 1a86d26810cf6b5d06aa2bc00fc56c8ad5a79a02 SHA-256: 56223c34280bbc4fd22ce20d601bf00634b2870d2e5c71c967a017430c34806c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external links, with one pointing to 'trafffi.ru', suggesting a redirection or download attempt. The PDF structure and the presence of embedded links indicate an attempt to trick users into visiting potentially harmful sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/strik?utm_term=tok+knowledge+questions
    • https://vabijerokajesi.weebly.com/uploads/1/3/4/5/134595953/bofalagijodowew.pdf
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/suxil.pdf
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/5791262.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc39939a879396864191ab0/t/5fc6e1fea3696915e2148db9/1606869502985/zombie_invasion_live_wallpaper_download.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf27fa97599144ebcc593/1606283904508/get_free_rubies_for_hidden_city.pdf
    • https://static1.squarespace.com/static/5fc5ca2f405d5340f34b3ea2/t/5fcdebabe43f2b00a8cc1701/1607330732349/neo._emu_paid_apk_download.pdf
    • https://static1.squarespace.com/static/5fc5dc2688c99b6d37c954d5/t/5fcf903e5c8977691e40f26d/1607438399678/download_idle_aquapark_mod_apk.pdf
    • https://static1.squarespace.com/static/5fc0cf2e60f2895dc1e766a0/t/5fc3a3201972c46e3c0d6b2d/1606656801151/pekoxivapulinafatapile.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf64b8eaf37e3b6493d3c2/1606378681724/81051127060.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf2243570fb44d1c85089/1606283812513/persona_3_helel_skills.pdf
    • https://static1.squarespace.com/static/5fc0eacbc14dfd36fef1915a/t/5fc155cd5147b14804653987/1606505946607/ni_no_kuni_2_strategy_guide_download.pdf
    • https://static1.squarespace.com/static/5fc2d1048139af037651a389/t/5fc512ebf3de5e49b505e676/1606750956378/30280760667.pdf
    • https://static1.squarespace.com/static/5fbffea5239b0722912c2f3a/t/5fc6d9ecb7521d608a33d066/1606867439029/watch_country_music_videos_free.pdf
    • 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_off0000e328.bin
43b78ed343e24d7f36815ece5e4129189f0db67f4029380d29bf2b63acb591f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 4916 bytes
font_01_sfnt_off0000f407.bin
0dadda245ba4ff45d165deaf62e310e666a9f0337a736b8b87549eea368dd57a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 10328 bytes

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