Malicious PDF — malware analysis report

Static analysis result for SHA-256 f781b05b4b3b3d65…

MALICIOUS

PDF

77.2 KB Created: 2021-07-12 20:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d5c117f4886b4ec3ec4a70c6d4fba3b SHA-1: a436ffa62b435196233b27a33bdb946aab07156c SHA-256: f781b05b4b3b3d651d64e095d15812571574bd77a996d5c23e4a5f9be1024b2e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. Although no specific document body content or scripts were clearly extracted, the presence of embedded URLs and the ClamAV detection signature 'Pdf.Phishing.Trojan' strongly suggest a phishing attempt or a trojan delivery mechanism. The PDF_URI heuristic points to a URL that, while marked benign, was likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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=descriptive+statistics+and+methods+for+data+science+pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9626cf492d21a0f6cb989/1625907820797/willie_nelson_amy_lee_nelson.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7816ff9c8b53cea137d8/1626109974701/99020819774.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8c51cd7702a4b9a6f592a/1625867548135/jipuxunukupakomen.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_off0000cbcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 16792 bytes
font_01_sfnt_off0000e3de.bin
d6c46f5bb13eba6dfa764b08ad81bcb2d55d4b972a29177cc9f12f72d65244cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 16720 bytes
font_02_sfnt_off00010f97.bin
0c0f2282867b32d8e18ed0b08cb4cb725fc2dce6a5e5980dad187fe00d8208d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 10908 bytes

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