Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f3aed857322076…

MALICIOUS

PDF

77.6 KB Created: 2021-07-12 20:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2af6915ba4b0bf031f4d23284b42bb7 SHA-1: 85f8511dcb7d6bff6d7b334928abfd908eff7e6c SHA-256: 21f3aed8573220761a072456f449c4928fdca8d0cb5cd9d216041f0f780628f0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded URLs, suggesting it may attempt to redirect users to malicious sites or download further payloads. The presence of PDF-specific heuristics and the authoring application (wkhtmltopdf) further support its classification as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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/sq/ugae/~3/iCUEKX862tE/square?utm_term=types+of+bernese+mountain+dogs
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7898a4261ba79805c6f9f/1625786762399/8600998482.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e827bf86d8930991a999bd/1625827264001/40350337745.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8c2a9b7022a177a596258/1625866921618/sex_buddy_meaning.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e84c2f3c4128e187655f/1625876556300/how_to_unzoom_a_chromebook.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_off0000d028.bin
0a9cc8893e359022df7ffdd89339e6c6b73b073d11f1f9a4ced3d0f38850f86b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 11112 bytes
font_01_sfnt_off0000e9ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 16792 bytes
font_02_sfnt_off000101c0.bin
7085e5cebe981848f46ddb697ce9c691ec04b102a63f403e91ab6214e880de8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 15936 bytes

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