Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf08cc81974c3f9…

MALICIOUS

PDF

70.0 KB Created: 2021-07-14 08:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c87994896b15cdc54c5a6249626a4683 SHA-1: 0db3e24c30f6df6fab8e50f2201090e960effc48 SHA-256: dcf08cc81974c3f965bc28c095dd861267d5e60d634174637ccdebfa9bca82b8
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect users to malicious content or download further stages. The file's structure and heuristics point towards exploitation of PDF vulnerabilities to execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6426

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/nCRFBnYrBHY/square?utm_term=party+time+gif
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ff42b132fa362071e6a9/1625882434732/kesepaxukodagegitilig.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e89908e883c0776abc5823/1625856264209/32469040047.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e91daf566ded7d61aca25e/1625890223585/sin2x_in_terms_of_sinx.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_off0000b4fd.bin
e6bd37b47b2885f889a8c752d249b3b03eda0e77f64e90b9c08d344b9d142058		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 15604 bytes
font_01_sfnt_off0000dd4e.bin
e36c146369aec89e1333cc227cdaad96a68fa922fc951edac81e286acbe242c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 10236 bytes
font_02_sfnt_off0000f456.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 16792 bytes

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