Malicious PDF — malware analysis report

Static analysis result for SHA-256 c927b7e57f9e0f3f…

MALICIOUS

PDF

77.5 KB Created: 2021-07-15 19:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: af8c38575ae1ef335afb652eda99e828 SHA-1: 7225bf980d329c88ed48499327a51853572eb464 SHA-256: c927b7e57f9e0f3feac8136a5ea2966c6771f0dde9fdb72a534dc8da4cdedcf0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URL pointing to 'infrive.ru', which is likely a phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, consistent with spearphishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.2210

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://infrive.ru/square?utm_term=city+attorney+in+spanish PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edba1bac23c31e62ffecf9/1626192411190/88746033567.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e84adaca800d6833deed26/1625836250981/wake_county_register_of_deeds_nc.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_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 16108 bytes
SHA-256: ffa4a6d1a7cf896131ff53e5eccd83cb084d9c4cbd1804c6fa1e04f06a53ac4d
font_02_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 10448 bytes
SHA-256: e077a26bb7e717f6ac278bdcd8ec54181143f9143426a4dd0bb88b5f1ad57fdd

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