Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f724627a37b6fbd…

MALICIOUS

PDF

98.5 KB Created: 2021-07-13 17:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcfda5103042f03953ed880b53332b53 SHA-1: a6f1d8b491fdbb94a300d20ec8fc132b8ac9099f SHA-256: 0f724627a37b6fbda50ad2b2e132ba47a3291dc6f299939720b9edefe6a58d74
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV with the signature Pdf.Phishing.Trojan. The presence of embedded URLs, despite some being marked as benign, suggests a phishing or trojan delivery attempt. The document body was unreadable, preventing a more specific analysis of the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1321

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/-MXWpcYQ7kA/square?utm_term=essentials+of+firefighting+6th+edition+pdf+download
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed914ff2de0a6ebf3523e9/1626181967453/compulsory_education_in_france.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7d0fde8c3264fe5e43b3/1626111247331/stick_war_legacy_unlimited_all.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_off00011c0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 16792 bytes
font_01_sfnt_off00013420.bin
851dedc0b6cde678f8dc295de02687ad25ca3e14377f20f561b20dd145115faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 18192 bytes
font_02_sfnt_off00016487.bin
39dde411b540184d128eb86f2f8df3d2a268570dac07ac8a7329f7417223e3d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16487 11012 bytes

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