Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15ac21d91e609c2…

MALICIOUS

PDF

68.2 KB Created: 2021-04-05 07:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea75d90944ca244e9346abbcd5f4d1f0 SHA-1: 93a711482edf46f467de69b696afc0205db9efee SHA-256: c15ac21d91e609c2006711a2147e9f9a0e10e95e093e6fc5573ebd9bc9c707cb
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 embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to reference product information, likely as a lure to entice users to click the malicious link. No scripts were extracted, but the presence of embedded URLs and the detection results strongly suggest a phishing or downloader attack pattern.

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://kuzutuzo.ru/strik?utm_term=casio+aq-s810w+price+in+philippines
    • http://bachanalytics.com/what_are_the_qualities_of_a_husband_materialp78mh.pdf
    • https://cdn.sqhk.co/wuxobilan/bZgg7ha/84060019065.pdf
    • http://didavixakodix.22web.org/escala_de_resiliencia_cd-_risc.pdf
    • http://rutetasilatigo.iblogger.org/ace_test_series.pdf
    • http://xivagoz.22web.org/69058042794.pdf
    • http://badge-verification-center.com/takirapeliy9dfs.pdf
    • http://securityverifiedservices.com/fish_farming_bengali_books9rr5u.pdf
    • https://cdn.sqhk.co/wakivugex/0jg6Phe/samsung_s10_payment_plan.pdf
    • http://gadokuzepot.22web.org/98398156898.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_f7d915bf4d23479090156f996c452488.pdf?index=true
    • https://s3.amazonaws.com/savukojubusum/fewokalozelanuru.pdf
    • https://s3.amazonaws.com/fezenur/arrow_formal_shirts_flipkart.pdf
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_e19233e946cd410dbe171f2686f5ad51.pdf?index=true
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_90b7dfa4140f4e938b67157c598e387c.pdf?index=true
    • https://s3.amazonaws.com/fikuvine/jasc_paint_shop_pro_7._02.pdf
    • https://s3.amazonaws.com/metubevozisul/91543413708.pdf
    • https://s3.amazonaws.com/feborobegibew/spanish_vocabulary_words_app.pdf
    • https://66547991-fb4b-492c-b271-2b6457db34f0.filesusr.com/ugd/a98e70_d171889f88424aa88544ad039c5baf01.pdf?index=true
    • http://semimuwido.epizy.com/vizajalogavajutunosewab.pdf
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_74cd5a246e4b4635897a5b6631038e8d.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_off0000c8a6.bin
41841f4e1091b8b8191406163fe4385a2079c132af0a15300f4923def4f9b3b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A6 5564 bytes
font_01_sfnt_off0000dbb1.bin
b1e8e06801de175d78b3d8fe2ab853d1cd3400f9c19b2a8c92fdc5531ad7a107		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 11240 bytes

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