Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7199043f750cec3…

MALICIOUS

PDF

85.0 KB Created: 2021-07-14 02:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65520d77587cd69a6d263252986a7642 SHA-1: 037368bc0f7a8ee832cb8f3c1d4a9de21560e10e SHA-256: f7199043f750cec31b18b173f7d6fb0f60eb9d573155cd376da136be6188fa7d
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, though some are marked benign, suggests potential phishing or payload delivery mechanisms. The PDF structure itself contains indicators of compromise, and the authoring application 'wkhtmltopdf' is not typically associated with malicious PDFs, suggesting it may have been used to package malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5817

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/v-xubMviL4Y/square?utm_term=easy+danganronpa+characters+to+cosplay
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7af3f52059f1ec1e1b72e/1625796415475/dedofutizusaninipoton.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e904838ce0e10532d1a24e/1625883779821/compound_bow_manual.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee1b6239b8260338679f41/1626217314468/tenawavel.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8eb208fb24157da6d8f4e/1625877280658/hurdle_rate_meaning.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_off0000ebd0.bin
d4bf0d1145ec90c18810fa0a900aae49c9b0ba93672599e255e18a9c347399a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 10796 bytes
font_01_sfnt_off00010475.bin
3c6d2638065d269d3df9db6485044ceefbb1f369679f58bfd9f881bb24fc3271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 16704 bytes
font_02_sfnt_off00013011.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 16792 bytes

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