Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58e00038dfe56f6…

MALICIOUS

PDF

79.3 KB Created: 2021-07-19 08:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 478c99511fc82c081cceaf819b69721a SHA-1: 744a0558f0aa7d14056b7f5563fe6c8d0724c8c2 SHA-256: c58e00038dfe56f6de717e0c459c676df0b3a94f93adbaffa8a10b5bf885545c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojanized intent. While no specific document body content was readable, the presence of embedded URLs suggests a lure to external resources. The PDF structure itself, combined with the heuristic firings, points towards a malicious document designed to exploit vulnerabilities or trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6198

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/~3/7R6buoffwiA/square?utm_term=complexometric+titration+of+zinc+with+edta+calculations
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8b6eef188817f7e23259/1626114926381/korumudebedejavaxerov.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f497b9c2d40e67ec1882a6/1626642361363/blueberry_muffins_from_scratch.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f28932699a8678c572a25f/1626507570489/konowekelux.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_off0000d216.bin
0f6b6dcee05c199464bf9408e42329d9b6b0d642cad3f5b6e843d4a8aad210bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 11264 bytes
font_01_sfnt_off0000ec69.bin
b908395ada9a1dce2a8cc5711a8334c477bafc0b3c8370299b67454e4c91c462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 17028 bytes
font_02_sfnt_off00011940.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11940 16792 bytes

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