Malicious PDF — malware analysis report

Static analysis result for SHA-256 91542748b6e1527a…

MALICIOUS

PDF

79.0 KB Created: 2021-07-18 06:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff52b789394a5c2b48d30d0fe96a14b1 SHA-1: 228895a46ca4287dcb50f6681671721998e7e4ac SHA-256: 91542748b6e1527ae106ec470aa784a66d8633bf0027d0fc2ca5907a9bc2cf74
96 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded URLs suggests the document is designed to lure the user to external resources, likely to download a secondary payload. The wkhtmltopdf authoring application and the nature of the heuristics point towards a phishing or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9098

Heuristics 4

  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/UZrB20b2Dcg/square?utm_term=programmable+peripheral+interface+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee23fa115d504d3a84766e/1626219514985/97583254906.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca7b0c81c37306b324195/1626122160149/66288711582.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f16590f75f957e35b98faf/1626432912130/download_gta_5_for_android_full_apk_free_without_verification.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee72e027fa864c7d14cd99/1626239712855/lil_mosey_dixie.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f07321e1e5f345c8e08203/1626370849930/blue_fish_with_yellow_fins.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f327715f13a15bd81ca729/1626548081678/6241691381.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee940aeed6cd77ab666378/1626248202706/paws_and_claws_boarding.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d460.bin
31a5a901cb8a97b68c7f4547d3db941aa1c531b41d7df2536799eaf49207dffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 16440 bytes
font_01_sfnt_off0000ff06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 16792 bytes
font_02_sfnt_off0001171d.bin
aff0873cb8e285c0ae0acd7bfb7f4f1f2058268f40c6ba03ea3a502bba248909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 11040 bytes

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