Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc436572834fdf14…

MALICIOUS

PDF

78.0 KB Created: 2021-07-17 14:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c73ca71122b5cdc7a75d9a7992cc8c4c SHA-1: 261164e1e1801c283d5b89ffab571c78c891bd0c SHA-256: fc436572834fdf140b95224d4b56e7043d95f19d78b2a872311ee103996e7cc2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a Google Feedproxy URL, which in turn redirects to a Squarespace page. While the specific Squarespace URLs appear benign, the initial feedproxy URL is suspicious and could be part of a phishing or malware distribution chain. No scripts were extracted, but the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/UkUWPC8UKDU/square?utm_term=how+to+get+apex+coins+for+free+ps4
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecabe8c426b81e8303c428/1626123240743/low_calorie_chocolate_chip_banana_bread.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8d12e0ada229be57794d/1626115346917/11726510831.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec830040121f566899ec36/1626112768871/43474870456.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed20077ab2906137d2d2c0/1626152968228/nepafaga.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8bb6f1b22c82f862c5114/1625865071590/xejesoxavegevamobejes.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8915419e99f7242455102/1625854293052/concepts_of_physics_volume_2_download.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec93d84f558d0bf39d2542/1626117080131/32218896615.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_off0000cf2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 16792 bytes
font_01_sfnt_off0000e743.bin
10c8cf7816fd2a79bded5a95df097f90d741f5691f19e03d5774b3a7a35984d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 10868 bytes
font_02_sfnt_off0001009d.bin
17dc58f51b3c22d901333b22653ada87d97d99cc1d4ebac42fe778a3c5ccdb40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 16516 bytes

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