Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab27a9e34f71c83…

MALICIOUS

PDF

75.5 KB Created: 2021-03-12 04:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b71ad1716f8d54b95ce560ff4a4b4dd SHA-1: 1ab8cf43fdb9b8b53767e8ee41dc89f38485c1fc SHA-256: 4ab27a9e34f71c8378345fb938366134bdf98a69e2fb4a9681e2203d1ed92dfc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=amazon+business+case+study+pdf
    • https://cdn-cms.f-static.net/uploads/4408319/normal_6047d5210b9d3.pdf
    • https://wobanavemo.weebly.com/uploads/1/3/4/0/134096337/80506045634.pdf
    • https://cdn.sqhk.co/wujamufaw/jxZZggy/evil_rising_district_78.pdf
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/2192444.pdf
    • https://cdn.sqhk.co/vekuniruf/iiiJwMM/design_my_home_makeover_level_281.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_601590c799c50.pdf
    • https://cdn-cms.f-static.net/uploads/4448986/normal_600a3dba628c0.pdf
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/de75ad53bbee7e6.pdf
    • https://cdn.sqhk.co/mopomotop/ujbUia5/football_manager_2020_mobile.pdf
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5fdf85565e7d9.pdf
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/9233385.pdf
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/fisulamatol-kafuzapaz-xikomije-bebuwo.pdf
    • https://bozaxadoduzake.weebly.com/uploads/1/3/4/3/134306622/a4022b075.pdf
    • https://ledegukumimajem.weebly.com/uploads/1/3/5/3/135393042/fepexalebegorip.pdf
    • https://cdn-cms.f-static.net/uploads/4371812/normal_6031e4fc7a8b8.pdf
    • https://cdn.sqhk.co/neviragar/gT2ifcc/money_maker_mike_froggy_fresh.pdf
    • https://pawasisuleti.weebly.com/uploads/1/3/4/6/134652657/c1f66a6fcb.pdf
    • https://nupewaxupojiga.weebly.com/uploads/1/3/4/0/134042887/kiziraz-fulonipotomak-bunenunego.pdf
    • https://cdn-cms.f-static.net/uploads/4376369/normal_60166607dfd37.pdf
    • https://cdn.sqhk.co/tivinarafuvu/ghjiaih/panther_online_mod_apk_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4381737/normal_602c76eb892f4.pdf
    • https://cdn-cms.f-static.net/uploads/4489852/normal_603b3b829319e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0df33ea0-ae3b-46e7-9325-553a983bf0a1/honeywell_quietset_32.8_h_5_speed_oscillating_tower_fan.pdf
    • https://uploads.strikinglycdn.com/files/5ea46c1c-a2d6-4bf1-8a61-4ce1cc1f30ef/bowulebaf.pdf
    • https://uploads.strikinglycdn.com/files/50106e05-083e-4405-88b7-41c4b8d9ce7a/twisted_tea_alcohol_content_tall_boy.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_off0000ea1f.bin
0c1715b35cd797bb7bf9426eba11f7213cf4d25837e9f1df6013efefd17e8606		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 5456 bytes
font_01_sfnt_off0000fcab.bin
b48a4bad5f8798df163f269bfabdb7a0a11ea5a49d75fcddf32351fbb7368bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 10420 bytes

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