Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0d6c6a16558fe6…

MALICIOUS

PDF

94.9 KB Created: 2021-03-28 20:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bc3b02cfad4952b935192bd215f60bf SHA-1: a25f736d8d81c8f1a16ad17640a2e198c97d8432 SHA-256: 5b0d6c6a16558fe6a511037b4a58e490b63db1a6a720694fa1acf864d58ec42f
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a review context, which is a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=wildgame+innovations+mirage+18+review
    • https://cdn-cms.f-static.net/uploads/4425772/normal_6036a55d0ca48.pdf
    • https://cdn.sqhk.co/gijesali/yibIyb8/zapenak.pdf
    • https://cdn-cms.f-static.net/uploads/4454429/normal_60128feeec825.pdf
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5ff7c04a7418b.pdf
    • https://cdn-cms.f-static.net/uploads/4408703/normal_60402fe7e5032.pdf
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd6541eb0117.pdf
    • https://static.s123-cdn-static.com/uploads/4470985/normal_5fcb56eac2e54.pdf
    • https://cdn.sqhk.co/ruxuvedije/hiCja3a/italian_music_ringtones_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4494874/normal_6039111da38f2.pdf
    • https://cdn.sqhk.co/najafizox/NrTggg5/star_wars_x_wing_fighter_helmet.pdf
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5fe13aa2cd945.pdf
    • https://static.s123-cdn-static.com/uploads/4373770/normal_5fed9646816ae.pdf
    • https://cdn.sqhk.co/xemugugafot/uhbgjxZ/nawavigofefoxetuxakok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/160e7f18-257d-4fcd-8494-3ac0434e46bd/belkin_ac750_review.pdf
    • https://uploads.strikinglycdn.com/files/34cf5a07-a12c-44ef-a217-1937fcee4eeb/37145069857.pdf
    • https://uploads.strikinglycdn.com/files/357931ec-dc33-411b-b732-64176bb6b545/what_are_the_qualities_of_a_good_wife_material.pdf
    • https://uploads.strikinglycdn.com/files/787bf9f8-df55-4955-8dcb-e6d11a37832f/how_to_wear_white_hair.pdf
    • https://uploads.strikinglycdn.com/files/fac2e0fb-dd06-4e5e-a55f-cff764c710a8/55893194100.pdf
    • https://uploads.strikinglycdn.com/files/7de2e4e9-3cfd-4b3c-ac3c-61dc2e2d030f/the_magic_mountain_free.pdf
    • https://uploads.strikinglycdn.com/files/c2f61ae6-46b1-4721-87af-ddea8e06526e/58800738543.pdf
    • https://uploads.strikinglycdn.com/files/7ef1ef84-6c0a-4677-b3d4-39b8373d0222/qu_es_un_aforismo_y_5_ejemplos.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_off00013346.bin
720096096a71b2a12625c59abe7621df977c809a2e415e13ed2629d3f7b88ad4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13346 5556 bytes
font_01_sfnt_off00014633.bin
64f8fb131cf02c59e3bc9cef7a2a2912f7d3a94abd89d42d26b6115068d4abde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14633 11068 bytes

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