Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8b074daedb209c…

MALICIOUS

PDF

82.8 KB Created: 2021-07-14 11:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10510326276ee4a1c6ec9822ecd8d4f3 SHA-1: 7f057ca957fa4cb1a1b85f7117ab8a4ee2a3b56c SHA-256: da8b074daedb209cb85eb242cad646683154a5eb812eb6afdcd3bacbb5ff537b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, specifically flagged as Pdf.Phishing.Trojan. The PDF contains an embedded URI that points to a URL associated with phishing content. While the document body is heavily obfuscated and unreadable, the presence of a phishing-related URI strongly suggests an attempt to trick users into visiting a malicious website, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.1542

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://feedproxy.google.com/~r/razvivatel/yapz/~3/7R6buoffwiA/square?utm_term=cp5191+machine+learning+techniques+notes+pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eda200c7772f26c8515440/1626186240440/41085426370.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7fa872e2584f2462e7b5/1626111912263/66228642809.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_off0000de36.bin
fc4d006af237fd065017a82b7c67faaf405ab340430a9cf8a2235243c0de2002		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 17860 bytes
font_01_sfnt_off00010c3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 16792 bytes
font_02_sfnt_off00012453.bin
5927e30f881dbc3cec39694603aea9e76426c331b76684beee71e775e7edcc84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 11700 bytes

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