Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68d452921d00e3d…

MALICIOUS

PDF

80.7 KB Created: 2021-07-18 04:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62d0669e116c3c10b50aa8908a0a43f5 SHA-1: 52dee05f79ae3dfb3116b730f6e33cadba810a35 SHA-256: a68d452921d00e3d13cf7d4c0d8c3d3bfb03a02827fe343dc96b69fccfdd50b2
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded URLs, suggesting it is designed to lure the user to external resources or exploit vulnerabilities. The authoring application 'wkhtmltopdf' is unusual for a malicious PDF, but the overall heuristics point towards a trojan or phishing delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9478

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://feedproxy.google.com/~r/razvivatel/yapz/~3/4Ji06Fp1PxY/square?utm_term=a2+english+reading+texts
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee8d996d75c50a5d4814a8/1626246553705/magical_child_archetype.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f164e0b0b7347a5227cbb5/1626432736624/83293463624.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f36a76db752c5e49acfa7e/1626565238669/fawagijufegivarajez.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edfd1ad9d5ad70ebd5fce4/1626209563233/17817831810.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1bd854f4330036e3e48ba/1626455429671/gotexaferoxa.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8cf01644c9b4de7f2a292/1625870081372/12361917698.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8e39b3b63f0898f2a62b/1626115641974/43023388321.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f25782e615ea111e5fb96a/1626494850690/nokozevutekerupojegeg.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_off0000d74a.bin
650d21fa2cd50428f7d0b75d6f3a30426981d0b33b8123364d6f177dd3aab8d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 17468 bytes
font_01_sfnt_off00010551.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 16792 bytes
font_02_sfnt_off00011d68.bin
63c1308679c3995e6bcd89311e62f6146ecd94548dc182b383cd55ec4d1bd58d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 10612 bytes

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