Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d503d25d5743301…

MALICIOUS

PDF

77.7 KB Created: 2021-07-12 21:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ae105bc4c9e3a537f5859d30d709605 SHA-1: 7d3389d7673c49b65e01b7667d5467548260cb7a SHA-256: 7d503d25d574330147f900b53f361dae84dd8d89e2419a31eb6634a0818f990a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV with a specific signature indicating phishing and trojan activity. It contains an embedded URI pointing to a suspicious domain, 'coretry.ru', which is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of the malicious URL strongly suggests an attempt to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier clean score 0.1551

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://coretry.ru/square?utm_term=bruner+theory+of+instruction
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7c72545e16b3be7e8a89b/1625802533699/rexukozojuvedibexopego.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_off0000cf2a.bin
56db15f687d6457f634eb5af8d07f683c43838f66d2a5741fef99b82883f0d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 10492 bytes
font_01_sfnt_off0000e712.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 16792 bytes
font_02_sfnt_off0000ff24.bin
46b74d5a2683a2f1dd74b8f95018f3ed2711be52dac6c2276aa29866a3f423c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 16828 bytes

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