Malicious PDF — malware analysis report

Static analysis result for SHA-256 4462a8ccea493b36…

MALICIOUS

PDF

74.7 KB Created: 2021-07-14 00:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ec26eb3ae39f111514d701429f274d3 SHA-1: e6b7135b69b088475a2cf8dc832fed018f67c0b7 SHA-256: 4462a8ccea493b36c62a7b5effa9bb20859bc8397c9902eac6f096197a60a4cf
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. While the document body is heavily obfuscated and unreadable, the presence of embedded URLs, one of which is flagged as potentially malicious, suggests an attempt to redirect the user to a harmful site. The PDF structure itself contains external URI references, further supporting the attack pattern.

Machine Learning

  • Nyx PDF Classifier clean score 0.2156

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/~3/4Ji06Fp1PxY/square?utm_term=when+to+watch+each+naruto+movie
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edfffdd6ef6771c1df8bbd/1626210301411/online_synthesizer_piano.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_off0000c36f.bin
334cf504d3c0511408dd72652b8ca12657a2d71e74a674379f65964498ea5e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC36F 16396 bytes
font_01_sfnt_off0000eded.bin
4a30875e1f5a6e45de05b3d80391ea85df8249ee5d1788bc69c5f361b3222818		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 10528 bytes
font_02_sfnt_off000105c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes

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