Malicious PDF — malware analysis report

Static analysis result for SHA-256 8144f83f20158b9e…

MALICIOUS

PDF

86.3 KB Created: 2021-07-13 21:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81aa7b59184b6e330aacdfc42bd810a0 SHA-1: 52463893c64fbf80229623e4d8ace5b645cb260a SHA-256: 8144f83f20158b9e484220d716541b0e24773269ddc4b4e0fea617085c54efed
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. It contains an embedded URL that, while currently flagged as benign, likely serves as a lure to a malicious site. The PDF structure itself is also suspicious due to duplicate object bodies, indicating potential obfuscation or malformation.

Machine Learning

  • Nyx PDF Classifier clean score 0.1542

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/razvivatel/yapz/~3/XMoLd4EPXkg/square?utm_term=how+many+lands+should+be+in+a+magic+deck
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed896ceaa19e084bc1e18e/1626179948987/definition_of_endurable.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8d6158d864752e01bf1b/1626115425940/ruzuf.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_off0000efd5.bin
7f886667059d6b32d3f40ce8db105ff8864ece358346f8a21a9b5c548119fc33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 16988 bytes
font_01_sfnt_off00011c11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 16792 bytes
font_02_sfnt_off00013428.bin
18786553cdcd27580f9fb3104404617fc681737f4054c8a546ed0f86d7e6085e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13428 11144 bytes

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