Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a511a894484c9e…

MALICIOUS

PDF

79.4 KB Created: 2021-07-12 20:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d91b73e56e3e6dcc6fa02aaa46bb621 SHA-1: a9663a809d26a5f52eda3e9d26312e276b4217a7 SHA-256: b6a511a894484c9ea291aed08b2de952c5b7816493572607f985915f3b82aecd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the presence of an external URI in a malicious PDF strongly suggests an attempt to redirect the user to a harmful site, likely for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6221

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://synerhu.ru/square?utm_term=2nd+grade+questions+and+answers
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7857ad4a1a22a3e64ce9/1626110039642/xonipovaxevegatazu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e91749f107ff2467e8a5ee/1625888585025/system_of_government_that_divides_power_between_national_and_state.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e79a5aadf2c26882fcbd65/1625791066805/calculate_the_percentage_composition_of_carbon_and_oxygen_in_co2.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_off0000d561.bin
5b7cb730a49c1ba88aceff565c6a8ad8cce9a78e2a6764389ec6e1fdbd9dccca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 17012 bytes
font_01_sfnt_off000101b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 16792 bytes
font_02_sfnt_off000119cf.bin
077b038bbe665e2c1be37f4f17e1ec2ff6f353dbf66d6e68e04a3469455c8a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 10732 bytes

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