Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b53b4a1d6d1cd8f…

MALICIOUS

PDF

77.3 KB Created: 2021-07-16 05:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1804465df243aa448dfbbc0489583278 SHA-1: 532466f720395d78b31fe0de548c2a2dfa786c1d SHA-256: 2b53b4a1d6d1cd8f94c4c92075a882b279894390c13fb6cc852e95028aeab419
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'infrive.ru', which is likely a phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8972

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://infrive.ru/square?utm_term=i+want+to+go+home+song+michael+buble
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e879089848097a3e18e1eb/1625848072125/fozobuvexenok.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed9948e0c6fb6066137450/1626184008362/80428291274.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0cebc8bcf896c915a2eaa/1626394300753/make_a_checkmark_in_excel.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7c963adf2c26882ffcf83/1625803107488/gawapogomigokama.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec71344c0b954f9ea25f8f/1626108212817/luvogepekobo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edfdd9afeffb59e6754d2d/1626209753497/brief_cognitive_therapy.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_off0000ca7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 16792 bytes
font_01_sfnt_off0000e28c.bin
440859f18f3ac5b68ac6d25866cc943d1ddb24fc94769a8d2915a6180e438dfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 17460 bytes
font_02_sfnt_off0001103e.bin
e415e7e9bbc0c5983b61f918afa9d91141b2238d4d7629a7af848033f972095e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 10856 bytes

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