Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b1cc3f7b5cef07…

MALICIOUS

PDF

101.4 KB Created: 2021-07-14 00:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e76e8a8bc3b69133aaa58e756505e62 SHA-1: dea18351c7a2b12349f2df8c84076fd361f22677 SHA-256: 66b1cc3f7b5cef0781b7def23d81bce676186519f66fcf8fd95db8adb2e72cc3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of an external URI suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5877

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://queure.ru/square?utm_term=mad+hatter+tea+party+song
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e90be2dc37083541b7e8ea/1625885666626/29155050999.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eda6ce920f291d392157e5/1626187470191/fft_in_matlab_code.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee0187cc8e436e466917cf/1626210695485/download_harry_potter_and_the_deathly_hallows.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_off00012b5c.bin
94230ab86c6a54041a4210206032859fbfd6afd12eabd4597d1548de244d0d7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5C 18020 bytes
font_01_sfnt_off000159fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159FD 16792 bytes
font_02_sfnt_off00017214.bin
a0052a257cccb65ddca224c20eaae4c2eebbc11b9a8f630d8a3ec00f021b7dc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17214 10640 bytes

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