Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc0d98be1f376dd…

MALICIOUS

PDF

132.1 KB Created: 2021-07-15 08:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f482f6c4451a79e1be0ea1a0ef6735cc SHA-1: 29913147bf8eba54f41b027fb43a9b29dc3cd6e8 SHA-256: acc0d98be1f376ddc21ff0963608a3e24b00382f9426aa443437ecfc239d7f9a
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a critical heuristic indicating a 'Clipboard command execution lure', instructing the user to copy and paste content into a shell. This strongly suggests an attempt to execute arbitrary commands. An external URI to 'catamma.ru' was also extracted, which may serve as a command and control server or a download location for a secondary payload. The ClamAV detection further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier clean score 0.1870

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://catamma.ru/square?utm_term=places+in+abu+dhabi
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79c4ffdc75e32ab03ebf1/1625791567463/88691206860.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60efcb96e00eb31d7cebb236/1626327958174/lapidutonoleke.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60efcc3bbba06d2f3416a346/1626328123784/83901264369.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00019c2e.bin
8b0befd977e8bd6bd77745b4ec50b8de18c4d7e37016132dd8b1a4f5537c8107		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19C2E 18356 bytes
font_00_sfnt_off000184d6.bin
55fcf7b6d61b2e0e72627393303f0816ccd8619d13a573ff63549fe8b1907047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x184D6 10392 bytes
font_02_sfnt_off0001b967.bin
eb1f37f637fbaad82f8435642dbf6fafdeb8a0fde385ab4cde23ee468a609558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B967 19680 bytes
font_03_sfnt_off0001ec70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC70 16792 bytes

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