Malicious PDF — malware analysis report

Static analysis result for SHA-256 767eaaa52a756801…

MALICIOUS

PDF

78.0 KB Created: 2021-07-13 23:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bd92a6b166e3bc9d46523b5d3d3cded SHA-1: 349fea171c4302a41c6ccac358faf4edea4392c2 SHA-256: 767eaaa52a756801faba9bfca8c8f67640cdd71024c6f34f57890ec78f2c665b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document 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 to download further malicious content. No scripts were extracted, but the PDF structure and the embedded URI are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.2227

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://crysiq.ru/square?utm_term=christmas+instrumental+orchestra
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e812a21c6ee137fa12fbc2/1625821858791/32850418777.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec92fbbc6eee4b058f8d36/1626116859256/my_period_blood_is_bright_red.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_off0000cfe4.bin
4fe1242a271dbb7daf0721ca3c2d944cc656d78382a0106c2fa5df6f624206ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 17236 bytes
font_01_sfnt_off0000fc3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 16792 bytes
font_02_sfnt_off00011455.bin
05f7bed52a3e05fa88ec70faf8679e9e8c24a5bf82ae802c93823589ab31a2b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11455 10628 bytes

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