Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83022d9dd6b54af…

MALICIOUS

PDF

81.5 KB Created: 2021-07-17 16:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76d87842c10a3c26bbeccc65e64ca5d3 SHA-1: 47e8ef34f1fa7a9132b9bbdf8ac78bcf21c345ae SHA-256: c83022d9dd6b54af4ae8d3a266e143afe369e6147bd1a4aec6af7d6157dbf00c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains embedded URLs, some of which are flagged as potentially malicious. ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or credential harvesting intent. The ML classifier also flagged it as malicious. No scripts were extracted, but the presence of embedded URLs and the detection verdict indicate a likely attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6221

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/~3/5Aj-mlxkUx8/square?utm_term=143mm+to+inches
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee8e9dc27d1e40a54eae1b/1626246813768/52509346534.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee0d2b2485902f3e6f6aa5/1626213676001/ma_approved_firearms_roster.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9395b025aa46e30d397b1/1625897307197/jefelijagegorodib.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_off0000dfac.bin
c2f0a07d31d5a8d37fa1e578837f36237eef4023802266a3c4f5e105f13167aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 10392 bytes
font_01_sfnt_off0000f712.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 16792 bytes
font_02_sfnt_off00010f24.bin
84a25420efb51c9639c60f09f2d72ef39f05ef9771cccbb9f404c1dd62c00a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 16696 bytes

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