Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb6758451c2e822…

MALICIOUS

PDF

74.5 KB Created: 2021-07-14 02:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9915dc5bc94176bf7abaf8d3b51d0161 SHA-1: 2dc728c000d5330b403daa64d383b52a8b348605 SHA-256: 6cb6758451c2e82298087fec2c3e25b23b639110c01a277e628fef2ba43cf50f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, which is likely a phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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=self+confidence+worksheets
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e817cd80504e0a776c1bc2/1625823181486/ngn_to_php.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee0412ea8d40126a20006d/1626211346658/didelizutejadoxavev.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8c1482aed951818547363/1625866568477/pdf_to_excel_ocr_free_online.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_off0000c47c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC47C 16792 bytes
font_01_sfnt_off0000dc93.bin
a609375c18eb21ab53d9c5f34536038b646020fb1474dc35141dab51a351c4cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 10664 bytes
font_02_sfnt_off0000f4fa.bin
96940f7dd935e9e36d2352a91424d939dfc20effcb000350433818c57752372b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 16084 bytes

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