Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df3fc953e660153…

MALICIOUS

PDF

74.3 KB Created: 2021-07-12 21:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95d0e1215a4c987e648ea3fd230df2b1 SHA-1: a43f2c8dda5c3a505159ea425f34ab1a58b3eaae SHA-256: 6df3fc953e660153fc0bdf521cd05c71dbe70af01c911d68411416a4285bb80e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating it is likely designed to exploit vulnerabilities or trick users. The presence of embedded URLs, even if some are marked benign, suggests an attempt to redirect the user to malicious content or download further stages. The document body is heavily obfuscated, preventing a clear understanding of the social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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://feedproxy.google.com/~r/sq/ugae/~3/r_nBws6J8g8/square?utm_term=principle+and+principal+meaning
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7b2d760c9e2bcf422cfa/1626110765566/80592438579.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e808029bae382bbac14fc4/1625819138737/35654457388.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7df6f4261ba79806149a4/1625808751143/fezibolejedinefixo.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_off0000c517.bin
c14aa2e24d2c557c9af03d8ed27d5ad0b9daa6fbaddcfd7173f16b8a04160530		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC517 15984 bytes
font_01_sfnt_off0000ee05.bin
d79e23fdf376b92c2207972cc358a2d0a736c39a12de9eef51e14665ab81f08b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 10472 bytes
font_02_sfnt_off00010574.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 16792 bytes

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