Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfc27d99a8d6795…

MALICIOUS

PDF

72.8 KB Created: 2021-07-15 21:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d67f3201ef4ab4e60e903865f8c6838c SHA-1: b579f9b74b821fef949240906596e25d7e0683f2 SHA-256: cbfc27d99a8d67953d711fccf1170a3911cf37cdc5697a5cc5250a0f915a2fd6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a specific signature indicating it's a PDF phishing trojan. It contains an embedded URI pointing to 'cructi.ru', which is likely a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier clean score 0.1797

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://cructi.ru/square?utm_term=faded+piano+notes+with+letters PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edcaa982b498735927b819/1626196649235/lotic_ecosystem_ppt.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eca931a1b53f2c22619eaa/1626122545581/zodudidubepebelabiwibe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF80 10552 bytes
SHA-256: 1bf64b344b70b4cca1d1426f7c58ac6b4fdd1da6f8c9fb865f674235631bce97
font_01_sfnt_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 15664 bytes
SHA-256: 3aec97c4bd1884b0a901403e70ce2aa5ba785992c30605b04e824d1b8b2d6e2c
font_02_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.