Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34a924904c91b0f…

MALICIOUS

PDF

76.0 KB Created: 2021-07-20 22:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5aaaafa6c22769e76fd640bc1115be33 SHA-1: 085eeedbd1962346fe0292a366b3fc086b0612a7 SHA-256: d34a924904c91b0f8a450186f9e0b7400c8f1b5b9822beca7644d4aa5581a630
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple security heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of embedded URLs, though many are marked as benign, suggests a potential phishing or credential harvesting attempt. The file's structure and detection by ClamAV as 'Pdf.Phishing.Trojan' strongly point towards it being used as a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/~3/4P1vZUbBa90/square?utm_term=track+and+field+rules+and+regulations
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e9110cb630645a0ef6cc36/1625886988318/the_art_of_trading_refined_ref_wayne_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e800649ebc0053f317f9d6/1625817188209/pioneer_sound_system_manual.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f2533a731d8c7c6ff29c40/1626493755121/hurt_love_quotes_in_english.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8d64a1b53f2c225e5305/1626115428719/kigolujatozonewotomo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91fffe6a58043b69197e8/1625890815331/incubation_period_of_aids.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed9acee0c6fb6066139922/1626184398861/sajogoruwamilepafejena.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee16cb588fb5669511611e/1626216139918/independent_contractor_income_tax.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_off0000cc57.bin
2c7ca7e25f056f9a8181ce44d5d4209939d11fe16e86f268375ee8c0e02f6bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 15120 bytes
font_01_sfnt_off0000f2c1.bin
6509f4c969002429c55553b9c1346a1b542270fe66855d6bd45280ea493ef31e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 10808 bytes
font_02_sfnt_off00010b9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 16792 bytes

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