Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db1d3084daf0539…

MALICIOUS

PDF

77.6 KB Created: 2021-07-14 00:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9b0bd7282356a95069ac2d32f04550a SHA-1: 00c001a440ae0ca3395f49cb0991ad8580f5ea6e SHA-256: 3db1d3084daf0539996900f8a16664da0a2b0a75c3fb12feadffd4d9fcda82df
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://queure.ru/square?utm_term=signs+of+muscle+atrophy+in+hands', which is likely used to deliver a secondary payload or conduct phishing. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7691

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://queure.ru/square?utm_term=signs+of+muscle+atrophy+in+hands
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e88a2191a9976fca48b37f/1625852449570/kimowotugogatimevajubiwi.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8c62861d88c0ca39fa846/1625867816809/marketing_career_objective_for_fresher.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec8138d0153e73bf8b8b8a/1626112313079/x_squared_parabola.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_off0000cc5d.bin
fc1222c6d60a422f59b2607fcdc1bf9031d3c312636ffc9b32032206545e40ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 11356 bytes
font_01_sfnt_off0000e6b8.bin
586d13553c047656696175fdb8bfd39af032b01b95cb11778e1b98d89e8e2d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 16376 bytes
font_02_sfnt_off000110e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 16792 bytes

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