Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8d27d338c8f61d…

MALICIOUS

PDF

79.2 KB Created: 2021-07-17 14:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5ee76a61abc7bd0530dc931b8ef3d05 SHA-1: e8238ab53823835db4182b2cc587e867ea6d96eb SHA-256: 1e8d27d338c8f61dfb70d3b8ac533c3d1406ef554feebd62ce490b31aadb0137
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URI that points to a URL which, despite being labeled as confirmed benign in the provided evidence, is associated with a heuristic firing indicating an external URI. The PDF structure itself is also flagged for duplicate object bodies, suggesting potential obfuscation or malformation. The primary attack vector appears to be a phishing lure, directing users to a URL that may host malicious content.

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/J-SxIuB37Ms/square?utm_term=project+cars+3+wheel+support
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f02fe8cd1cf129e165aeee/1626353640523/93573528032.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f096c99d73d13cc78b7baa/1626379977414/selective_non_catalytic_reduction.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee320a114e6b7b7de63126/1626223114875/38879068497.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0ed2f1d6532080098ee36/1626402095348/little_nightmares_free_download_android.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_off0000d3c8.bin
5f72abbf19581c7b286997a9fce3bd2d4ae71a2102e4f82ffa8b8bd73e590677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 17068 bytes
font_01_sfnt_off00010042.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 16792 bytes
font_02_sfnt_off00011859.bin
01b4d6c2b143ab28939bdf47054ac6202cd24ce51ced157d5b31804333a32b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 10764 bytes

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