Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66b8ca7351be93c…

MALICIOUS

PDF

74.6 KB Created: 2021-07-14 05:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a51b8bd16e434cee4c7f3558a727937c SHA-1: 3758df0ebac778ed4d4371c37688ee211a12c38f SHA-256: b66b8ca7351be93c2cef46be1fe2b5503101040ed629968d00c9e5d65f500e61
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://cructi.ru/square?utm_term=within+the+context+of', which is a strong indicator of a phishing or malware distribution attempt. The PDF structure itself does not contain readable document body text, but the presence of the malicious URL is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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=within+the+context+of
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec90c380388a1034d825c8/1626116291416/33353789866.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed911e43ec04194fd9e554/1626181918400/bear_and_the_dragon.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eddeca7ce58f02ed93f9df/1626201802847/affect_on_people.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c09e1b56fd05757a33e1/1625866398794/75296181992.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_off0000c6d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 16792 bytes
font_01_sfnt_off0000deed.bin
c746aa9521c7270b8791d2a8e60b34970a6df8a4339a8208b3c9e759c817a1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 10052 bytes
font_02_sfnt_off0000f53c.bin
3e54abe55d9cd0986e1e8185bd8244374137451fc6a67a03cebf49e2b38e7121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 16164 bytes

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