Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aef1c54aa20d8ae…

MALICIOUS

PDF

76.2 KB Created: 2021-07-20 03:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 301f5e4b29e43aac4d2df0d499c2a1c7 SHA-1: e5070f8c8d7432802b79d57e4fac887535278b5d SHA-256: 8aef1c54aa20d8aef713892c327d43236f884bdd85919e6e2854273c31a741c7
96 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content or exploit kits. The wkhtmltopdf authoring application and PDF structure suggest it may be used to exploit vulnerabilities within PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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/UZrB20b2Dcg/square?utm_term=bond+paper+width+and+height
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f09d89cd250d1e59e05345/1626381706040/my_muscles_get_tired_really_fast.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f44e7f8a396f1703a865d5/1626623615408/odsp_mandatory_special_necessities_form.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed89d866c2900cf5622764/1626180056774/wuwuxo.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_off0000c7aa.bin
a5fe36357ce60d024e9c76629b08ef810507906225a4088225d3bcc5d615b441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AA 17320 bytes
font_01_sfnt_off0000f528.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 16792 bytes
font_02_sfnt_off00010d3f.bin
151c60b05a7f421a3e0a9c0e6d34145a5116bd05dc510592a246cf635a87ad12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 10596 bytes

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