Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd63ba31db4945b9…

MALICIOUS

PDF

95.5 KB Created: 2021-07-19 04:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e6229ff3b0321bf56c4505f37b328e6 SHA-1: e0dcc00db3809892de4b5ddd9c6de3775c811ba9 SHA-256: cd63ba31db4945b9a17a71b61ce6f1cde595d452af42edd5b754ec9aef9f93cb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The presence of embedded URLs suggests an attempt to redirect the user to malicious content or download further stages. The file's structure and heuristic firings point towards exploitation of PDF vulnerabilities to execute arbitrary code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/pL_UGxDroB4/square?utm_term=off+side+rules
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edb6ad3680ef421b573f77/1626191533588/tagovubiwofuriraf.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f3a2a96167905317de8000/1626579625276/gewugimelewateposetu.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f48fec0dbab00e46f02ab1/1626640364144/wisofepe.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8424c217102653d657cd/1626113060640/transformers_the_last_knight_watch_online_in_tamil.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e831d7f4d7c53d8b16ba71/1625829847263/vakuviwuxulexowaxulubopo.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_off000115e0.bin
fa46f84782e26e7ef612e72afbb90c73b7b9cf14b575dc4988b6f3184cade90f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 9988 bytes
font_01_sfnt_off00012c20.bin
8269ed55ce8323e7a29ba541e692a9247552fe186fb6c3b870e5b6e23fdec592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 17644 bytes
font_02_sfnt_off00015a22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A22 16792 bytes

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