Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8b6682ba4035e2…

MALICIOUS

PDF

81.2 KB Created: 2021-07-15 11:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8ff47ed6685f7d73e8129c8c7f9badd SHA-1: b726c47f0e72b221222613bf52888a135517c040 SHA-256: ff8b6682ba4035e27c3833bfb24655770afec241e4a00e2297c215b72674f067
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ClamAV heuristic 'Pdf.Phishing.Trojan' strongly indicates a phishing attempt within this PDF. The presence of embedded URLs, even those initially flagged as benign, suggests a lure mechanism. The file's structure and the 'unknown_exploit_score' point towards exploitation for client execution, likely to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.1838

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/gOBB6uaVNRA/square?utm_term=ascii+code+for+capital+letters
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ece133c439f828715d9935/1626136883825/sentences_with_punctual.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_off0000d482.bin
494648d369c02ba2a4d111003a55dd0e3ff43f5edbc85e7593967cb33cf3cd22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 19056 bytes
font_01_sfnt_off00010793.bin
b3f4dd660bfd8d2e4f081af11c5655d38580e62f8d7b037ebb43ff849314c95d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10488 bytes
font_02_sfnt_off00011f8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 16792 bytes

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