Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c25d09aee055864…

MALICIOUS

PDF

78.2 KB Created: 2021-07-13 16:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea37ac3b98156d742eb0de278a383273 SHA-1: cd2f6ea103e51e3d50842f0f7cd84bee0dc7be7e SHA-256: 4c25d09aee055864024f9e1bdf7b718bedcfaa66d78e44369064acbdae97ac8f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The presence of this external URI suggests an attempt to redirect the user to a malicious site, likely for phishing or malware distribution. No scripts were extracted, but the embedded URI is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3811

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://krisoc.ru/square?utm_term=jquery+checked+selector
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed737302ab3a569c446ab4/1626174323979/how_to_make_gold_in_hearthstone.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed5289c2b47a6141a1ffb4/1626165897276/a_pure_chemical_substance_with_its_own_characteristic_atomic_structure_and_chemical_properties.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec78563a853d606aeb459e/1626110039078/worksheet_of_weather.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b878.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB878 16792 bytes
font_01_sfnt_off0000d08a.bin
7151d6e2508ec1dc29f239ae28080d27d23d90f18e0c7c3afe1bdb4caccf7327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 16188 bytes
font_02_sfnt_off0000fa45.bin
e30c9d3d7ed4806b2f5ec07bd0ed4ba602f4434b2040df1602d863246f58152c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 6668 bytes
font_03_sfnt_off0001123a.bin
663d98eb33c5e0dffc993ed087fa4d3c5709234339f1b6e94c764416c38de616		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 10552 bytes

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