Malicious PDF — malware analysis report

Static analysis result for SHA-256 def152e9c7191c8f…

MALICIOUS

PDF

102.3 KB Created: 2021-07-14 06:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c7b47d6a50ef504ed74e1cc3802fdf0 SHA-1: fe7308c58e3ca3fddb81636543da41f15274c7ac SHA-256: def152e9c7191c8fbde5670c7c254268ccaf9426d227b9138c1bef46b3ee98aa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI pointing to a suspicious external domain, identified by heuristics as PDF_URI and EMBEDDED_URL. ClamAV also flagged this file as Pdf.Phishing.Trojan. The ML classifier also indicated a high probability of maliciousness. No scripts were extracted, but the presence of the malicious URL suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7738

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://huntic.ru/square?utm_term=membrane+bound+organelles+that+transform+energy+in+all+eukaryotic+cells
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edc56c8f209f4d82816a04/1626195308621/25635176775.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee105fdf274736e0a81936/1626214495782/1567814233.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e9403a0cbdad4d3506cad8/1625899066918/black_beauty_story_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edc0f08e89d93564d1d839/1626194160569/pedigree_analysis_of_colour_blindness.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e863a1c97db7215f899634/1625842593247/fundamentals_of_soil_science.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_off00012eff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 16792 bytes
font_01_sfnt_off00014711.bin
014ccbf03603088d80c08654b7169c45c081ef717fc2ec5c348afbae4f215f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14711 16636 bytes
font_02_sfnt_off0001725d.bin
8ceb64242d469b2c4a9eeadc9bd3289e4cfcde752af897da9454ed82f411430b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1725D 11364 bytes

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