Malicious PDF — malware analysis report

Static analysis result for SHA-256 820f1a45381b807c…

MALICIOUS

PDF

74.8 KB Created: 2021-07-16 14:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a87b329607c31612fe26fc3a25fb63db SHA-1: 6e71ce177f8794d0baf9011fd4f9c87e89b35050 SHA-256: 820f1a45381b807c00d9778d64bfa871f742d121f1366273e568b88bd4b53617
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. It contains an embedded URI pointing to an external website, which is a common tactic for phishing campaigns. The PDF structure also shows signs of manipulation with duplicate object bodies, suggesting an attempt to evade detection or embed malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1609

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://oniceh.ru/square?utm_term=rotate+triangle+90+degrees+counterclockwise+calculator
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f062e56a82526f761332bd/1626366693929/lohengrin_elsas_procession_to_the_cathedral.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_off0000bd5f.bin
edfdca45a36bd429d6dfcfedae42c18b8b797be37054f273756aea8e7403722e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5F 17316 bytes
font_01_sfnt_off0000eb28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 16792 bytes
font_02_sfnt_off0001033f.bin
f0e4755fe45e2b29c5c4d4692daddb9eb9ee5648a39648b47bc339a81ab61a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 11160 bytes

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