Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76eb058de61ef9f…

MALICIOUS

PDF

72.6 KB Created: 2021-07-14 01:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ddd6a259a8787a84f54c9b6254107b5 SHA-1: f025859628183d5efc88bf40be13a7b95edc257f SHA-256: a76eb058de61ef9f96319c7784429e66647ed3bf843762aced2ea65332712947
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'synerhu.ru', which is flagged as unknown reputation. The PDF structure and embedded content suggest it's designed to trick users into visiting this external link, likely as part of a phishing or malware delivery scheme. No scripts were extracted, but the presence of an external URL is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6242

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=portraiture+by+angel
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7e64dbb514329faeb550/1626111588507/feast_of_the_tabernacles_in_the_bible.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee04a0537dfa200408ae7a/1626211489300/dobasekiweziv.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed72bfc1f2f61945a3d8a0/1626174143754/where_to_download_ps2_bios.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_off0000ba7b.bin
8acd6052fa948eabe737d9b7055c2124fe742f1fc666655cc4bebec2b52561b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7B 10468 bytes
font_01_sfnt_off0000d269.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 16792 bytes
font_02_sfnt_off0000ea7b.bin
45dd487e3abccae13411b7ba58fec033a31c7a4142691aad77e893d32dde8b59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 16932 bytes

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