Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f33f40924595e0f…

MALICIOUS

PDF

77.6 KB Created: 2021-07-13 16:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5bf2e070055207153b20ded1866a19c SHA-1: e62660ec1d382f07e2b29adfd59d0d03e6d5a366 SHA-256: 4f33f40924595e0fc62a58570b62cf1d5794bd3cd01ea320e07d58795e7eaa61
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for ClamAV detection. An external URI was found embedded in the PDF, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of an embedded URL points to an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

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/UZrB20b2Dcg/square?utm_term=international+astronomy+and+astrophysics+olympiad
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecda5a0124a666ff3be12d/1626135130887/fitagopulalole.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed97df4325c5343bb92822/1626183647411/4_liters_to_gallons.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e84ca630ecfa0852d539ed/1625836710165/58030856746.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed3af3f77a3e4a90f21c89/1626159859098/tenogetasidowasototonuzed.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_off0000ce7e.bin
18e125d891ff3b4c9fd8a949e478bcc630ea002d9168a78ece3a70a5a8495500		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 16520 bytes
font_01_sfnt_off0000f97a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 16792 bytes
font_02_sfnt_off00011191.bin
aaac597ed45433d0d502eb804cbaa33023d33df71b840993606f559bf5091751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 10844 bytes

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