Malicious PDF — malware analysis report

Static analysis result for SHA-256 94138d9b56894ebd…

MALICIOUS

PDF

76.3 KB Created: 2021-07-15 11:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7be6c3426edcc8e8be56e5ede4d7f7a8 SHA-1: 79f9ed4504aed40504cf6f9f6a4a6d9eb60fe1e0 SHA-256: 94138d9b56894ebd55f9d704fa5d898b0b4e6a1a70f6dd88cc3951e671d0c6bf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a Google feedproxy URL, which in turn redirects to a Squarespace hosted PDF. While the direct URLs to Squarespace were benign, the presence of the feedproxy URL and the ML/ClamAV detections suggest a phishing or malware delivery attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/sq/ugae/~3/qI_NY8u86tA/square?utm_term=mete+out+punishment
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7eb812c1416d2f1a49dd/1626111672920/nasokurebutepapemas.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee613b7c5bce1f334f54e0/1626235195747/37038188247.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee727786aa876280bfbaf8/1626239607959/fepixavomoximadi.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efd3336611482e0a8f0990/1626329907649/chocolate_lava_cake_for_two.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e86ef5661a887b0000fb31/1625845493585/40913206875.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e79b27a3609a707ba8905c/1625791271659/how_to_check_if_instagram_account_is_private.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efe9765740a719f4ab2d11/1626335606453/jexipadodopo.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_off0000c6fb.bin
b978b5bb9e19f3f81bcd9cf40e903d8294619ab6d1302ed4efc5c08975aa7b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FB 17772 bytes
font_01_sfnt_off0000f518.bin
27b42584d3f1a5a3af6d414fa52c3a3e389d64245156b820db7c90048801e723		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 10300 bytes
font_02_sfnt_off00010c21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 16792 bytes

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