Malicious PDF — malware analysis report

Static analysis result for SHA-256 603c62ef45e0c6d9…

MALICIOUS

PDF

79.7 KB Created: 2021-07-18 03:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9be27d572cab02aede1040580afba0ae SHA-1: ab52c29c8fa799ed52759895720b9de5a96bc636 SHA-256: 603c62ef45e0c6d96b399186bbfda5dc66ae311ac3fde4b1405932848c94510a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded URLs that likely lead to phishing content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/sq/ugae/~3/kVSxLQpkboc/square?utm_term=backgammon+games+games
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f079d68794681325074bd1/1626372566203/dasirijupodonabunefaf.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f2961a9c57c24939336c72/1626510874421/welokufajanep.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f070bd1a769948b752abd4/1626370237903/39877102430.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7c30a85664d35b0e64114/1625801483044/78595608305.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_off0000d6fb.bin
a23055510aef62c382d1d8a2b6f0b1a1044a4659267be3b09cc1b88bd3d36d8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 16960 bytes
font_01_sfnt_off00010369.bin
b401bb5fde155d39a2b8d20db02a7cfa7520aba36a4aa9ab5d4a102c0f7ffc27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 10384 bytes
font_02_sfnt_off00011afb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFB 16792 bytes

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