Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef50c87e6917df03…

MALICIOUS

PDF

92.1 KB Created: 2021-07-15 21:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a8a24bd1380ed02e40079d4f1e0aea0 SHA-1: 0e18ac5173f7e20304bbc447cdc620f7fc849fbc SHA-256: ef50c87e6917df03df44e5519dcbf4d8d7ff7e8efad0b704c5a70601a31bce95
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URL that, while flagged as benign in this analysis, is part of the attack pattern. The PDF structure itself is suspicious due to duplicate object bodies, suggesting obfuscation or malformation. The primary attack vector appears to be directing the user to an external URL, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.1532

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/gPkW7oTCsL0/square?utm_term=historical+institutionalism+in+contemporary+political+science
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7829b6dedd3ae167a2ff/1626109993451/ravunesotulisomanoxinorum.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_off00010609.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 16792 bytes
font_01_sfnt_off00011e20.bin
fb0cecd6dcd0b5c667ab6fdd9ef30918f4f8adccd8029466481bf9b0a5adaa94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 10740 bytes
font_02_sfnt_off000136cc.bin
b5210b1a9af129d3460c5620fa690c8f20377ca879a62cfa244e83f2a9b5bb51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136CC 17536 bytes

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