Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ded537a6154c9e…

MALICIOUS

PDF

77.7 KB Created: 2021-07-14 08:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c074b47e2e69546748fdf09ee59c35d SHA-1: 6fe0414eefe7ebeb767717a1a8840e4390fa8a70 SHA-256: a3ded537a6154c9eeb376926c1447ddfa640c1a366ae4e1f5b68ce3933aeec32
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded external URI pointing to 'https://infrive.ru/square?utm_term=some+time+off', which is likely the malicious payload delivery or phishing site. The PDF structure itself does not contain executable scripts, but the embedded URI is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8827

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://infrive.ru/square?utm_term=some+time+off
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee3cad114e6b7b7de6dcd3/1626225837698/menapitiniwike.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee5deb84a0477e84ad6c70/1626234347471/82254219404.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8069897884458c9a35801/1625818776774/nidanovomo.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec930151a87c5d75ad2ad8/1626116865455/81202202834.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e80a511c6ee137fa12afa2/1625819729591/64799888022.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee32c98e3fff2bd3bfc44e/1626223305228/brother_mfc_j6910dw_manual.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_off0000d0e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 16792 bytes
font_01_sfnt_off0000e8f7.bin
a6f85b00b9ecbf34f31318b36c52037882eba55526b7fb733e316d8db205d94a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 16720 bytes
font_02_sfnt_off00011403.bin
48cd7409432bb7c0ceb95db0de3ef15569522d06196521a8c420c499cbc8a5e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 9868 bytes

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