Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fa35c45afbd4bd…

MALICIOUS

PDF

77.1 KB Created: 2021-07-14 04:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6222e70a1eb3a9629afe0bb85bcef6e3 SHA-1: d4f77c465bf36626cac45cd6b77d8577c1a9de05 SHA-256: 77fa35c45afbd4bd65c9e28d54ae13d6bd514de108282642944f8b005b1c375e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. An external URI pointing to 'catamma.ru' was extracted, which is likely part of a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the presence of an embedded malicious URL strongly suggests a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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://catamma.ru/square?utm_term=ms+and+drooling
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec9bf91d0b393375532837/1626119161875/for_and_since_worksheets.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec80ce72e2584f24630f94/1626112207091/if_3_is_a_zero_of_the_polynomial.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_off0000cca5.bin
5cd90f2adc1fabb406a1613df5f66d30ee33a10834f27690b4742e7d8f7f62c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 17416 bytes
font_01_sfnt_off0000fa66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 16792 bytes
font_02_sfnt_off0001127d.bin
ec319e50ec3e8a396d7266613bb4c423f7183633a888c279d08dc4cfa6497070		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 10188 bytes

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