Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddadc2075cd59196…

MALICIOUS

PDF

78.0 KB Created: 2021-07-14 03:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4167852b6c7666371d659dfd36f4faf SHA-1: 3b7abcce7bef0cf5812676e819fb9ea6ab4a2c08 SHA-256: ddadc2075cd59196108c12a55caa94367e444f067e65c8abfcd0cf8bc99f5d23
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating it's likely used for phishing or malware delivery. The presence of embedded URLs and the PDF structure suggest an attempt to exploit vulnerabilities or trick users into downloading further malicious content. The authoring application 'wkhtmltopdf' is unusual for a typical document, further raising suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8791

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/rCno-htTzZk/square?utm_term=celtic+meaning+in+english
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e947e092abcc18c4f74d38/1625901024664/recommended_line_for_baitcaster.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8d0173bde986563e465d8/1625870359648/wave_function_mcq.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec7e98c217102653d5b14b/1626111640781/how_to_color_on.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7bab94454ab0ddd845290/1625799353976/scope_time_budget.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e827e345e16b3be7ece45a/1625827299841/how_many_ounces_are_in_140_grams.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_off0000cf71.bin
d8df393371b849e7f7d17f55f8701bf1c6ff32f835e048de55edd94d04e9bef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 17484 bytes
font_01_sfnt_off0000fc60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 16792 bytes
font_02_sfnt_off00011477.bin
899fe7e36bf59f2b28c791ab44eeb531e3a0ea1516b9e31c39582892792158b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11477 10488 bytes

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