Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de4d6b2b5009ac2…

MALICIOUS

PDF

74.5 KB Created: 2021-07-14 08:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cf728d5060c2b08a2a13f1e0d2d6871 SHA-1: 8ef99de775ca0efa10005e74256cdc611b428409 SHA-256: 5de4d6b2b5009ac2d7d9a0ff347d069c55112eb4bcc9148d6a8d686f7e0212c7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. An embedded URI points to 'https://pistant.ru/square?utm_term=hoover+al+drivers+license+office', suggesting a phishing lure related to driver's licenses. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing attempt designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8028

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://pistant.ru/square?utm_term=hoover+al+drivers+license+office
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e91f34f492d21a0f6ada78/1625890612791/wusapokurup.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7da97726b430b467a24f/1626111401761/45175793074.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e903f6b630645a0ef630d0/1625883638368/72876427288.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_off0000c463.bin
bcee85b78c459c0252460bff7aec5bdde238b4b5fb4b6659ffbfc81c3ac6898c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 10428 bytes
font_01_sfnt_off0000dc0c.bin
60122d4a4cee4897abad6276cffee8455eb021fe12882421b6b085cc60665248		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 16296 bytes
font_02_sfnt_off0001062e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 16792 bytes

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