Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb63cb0619f00a6d…

MALICIOUS

PDF

77.4 KB Created: 2021-07-13 20:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcc9c62756524bc908b344b39e0608ad SHA-1: 4a281a4748264b97c981113e7d924344c6ed2631 SHA-256: cb63cb0619f00a6da33e95ba5b5d8474228f9c287029f12cb0ff3a71ca2bf5b4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL that, while currently flagged as benign, is indicative of a phishing or malware distribution attempt. The PDF structure and heuristics suggest an attempt to exploit user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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://feedproxy.google.com/~r/sq/ugae/~3/nCRFBnYrBHY/square?utm_term=grand+hotel+kaohsiung
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edc4d71f6a9512286d1d96/1626195159910/90324164420.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e897b4cbb59707e327bd5e/1625855925038/13347008216.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8f154f558d0bf39ca7df/1626115861944/macro_calculator_for_weight_loss.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7f364a8bde38c3444df5/1626111799087/types_of_bernese_mountain_dogs.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed01cabde79631d33a38ca/1626145226659/ninitejusujutukutufovevo.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_off0000ce2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 16792 bytes
font_01_sfnt_off0000e63f.bin
0d4c805abf87b22184dd392721c2decfd22d47232b2238ce1d11bf6ebe4522c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 17048 bytes
font_02_sfnt_off00011186.bin
75450ec7ef66a9397d947f93c62bc07256d3b3402687751ac3792a8067637759		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 10756 bytes

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