Malicious PDF — malware analysis report

Static analysis result for SHA-256 9788f3d6d2223bbb…

MALICIOUS

PDF

76.0 KB Created: 2021-07-12 23:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3649b98fbb48bef5a5e876813e8053bb SHA-1: 26441b77c53acdf5ca97bc6d9d5f2affb21ff415 SHA-256: 9788f3d6d2223bbbf8481aace4d58735d0bd7803d078f336c241f9da36e3cd5c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. It contains multiple embedded URLs, some of which are marked as benign but others are not explicitly classified. The PDF structure itself is malformed with duplicate object bodies, suggesting an attempt to evade detection or exploit PDF parsing vulnerabilities. No scripts were extracted, but the presence of embedded URLs points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/hIkXU_AiHkM/square?utm_term=foundations+for+practice+in+occupational+therapy+pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec9ba11cff58014d55ef82/1626119073493/we_should_all_be_feminists_free.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e903688915684aa53c08ab/1625883496998/one_fish_two_fish_download.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_off0000c639.bin
89036e69bb63bae5f334dde5f8c938b6ccf9cda20f7470e64dbe562a11508453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC639 10908 bytes
font_01_sfnt_off0000df71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 16792 bytes
font_02_sfnt_off0000f783.bin
1e56502dc3cd5b94f1ddf66668140fbe3977052859e9e9c8de246294b0878f51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 16972 bytes

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