Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3605eaa4811cca…

MALICIOUS

PDF

84.0 KB Created: 2021-07-17 00:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d665a4bf4e819ecb8508de931b17a859 SHA-1: bd7122cfafff0c883cda9af45cd5535517d85430 SHA-256: aa3605eaa4811cca41f176016590223e0a460edb86d0bceae966f1fd1149efca
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and an ML classifier indicating maliciousness. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources. The file's structure and detection as a phishing trojan indicate it is likely used as a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/razvivatel/yapz/~3/nCRFBnYrBHY/square?utm_term=what+surgery+did+they+do+to+emily+in+handmaid%27s+tale
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7fd73687a3d659a4d6669/1625816435303/masshealth_eligibility_review_form.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee65ed2a4cda1762609c1e/1626236397299/spectroscopic_techniques_and_applications_engineering_chemistry.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e78764c44a0c56b69eca1b/1625786212878/collier_docket_search.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1fedfacf5f279115b9745/1626472159446/the_air_he_breathes.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_off0000e682.bin
18b60114b097559545e25ae7f2077b1aebda7dad1e3088cc424ca3715080505f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 10936 bytes
font_01_sfnt_off0000ff8b.bin
55fff547b07c0a4b6425f24e0e070374ffa4f2b83374f35401df8ed04d64e900		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16316 bytes
font_02_sfnt_off00012a0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 16792 bytes

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