Malicious PDF — malware analysis report

Static analysis result for SHA-256 82602217a169cd12…

MALICIOUS

PDF

73.8 KB Created: 2021-07-17 15:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1efd10b06359ccadc8832bccb76f4b9 SHA-1: 953c269a3daf583aa66936bc1eb2bfcb70987283 SHA-256: 82602217a169cd1278bfd2b0424b749f708a35a66cdaee49beed3dd5d9b0d97d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or malware delivery mechanism. The PDF structure and heuristics point towards exploitation of PDF vulnerabilities or social engineering tactics, possibly involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7882

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/~3/1LSSs5qy-i4/square?utm_term=the+witches+and+matilda
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8e6b38ce0e10532cfc222/1625876147792/better_english_accent.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c9129ffc3426e8a4b36f/1625868562409/report_sample_for_students.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60eddfb0afeffb59e672279c/1626202032738/how_to_get_pictures_from.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec850db6dedd3ae168e905/1626113293996/43515618226.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_off0000c25f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC25F 16792 bytes
font_01_sfnt_off0000da76.bin
d78257a41e84a058e9a7af7a77762104b4481e5774300381330bd4a99609ecc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 10464 bytes
font_02_sfnt_off0000f217.bin
fd694865c443eee5e5f3f0f6fcb3aaf9d11ee50d539b218ecfe39b81b45bfc60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 16420 bytes

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