Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dbdf3f7ef1d6cb…

MALICIOUS

PDF

76.5 KB Created: 2021-07-17 20:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 829c5be7217413690b580aba22b19b06 SHA-1: 1f445c264a6259122051b67d5f058fb23d31e44a SHA-256: f6dbdf3f7ef1d6cb57fdd756f7a394cb94e1528ad9be65d4f401e4114037f298
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains an embedded URL that, while currently marked as benign, is indicative of a phishing attempt to redirect the user to a malicious site. The ML classifier also strongly suggests maliciousness. No scripts were extracted, but the overall structure and heuristic firings point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/~3/5JeRQhMeIYg/square?utm_term=couples+counseling+before+engagement
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f308bf1434f635471ff4be/1626540223815/wotuna.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f11bf6008c226a942506d5/1626414070702/sekin.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f302afd68f322590552854/1626538671949/reduce_pages_of.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e873e241ef1372986019ac/1625846754110/draw_and_label_a_diagram_of_the_digestive_system.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_off0000c896.bin
bf07a4f5a6ca4688be0a799b27a068e215fa46a56de08651a35b97acdde68d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 16848 bytes
font_01_sfnt_off0000f48e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 16792 bytes
font_02_sfnt_off00010ca5.bin
c98f9567a3c2fa5b0a9b3d478a7d7d6808f67c7d16fd6de16c72b2c6d0d15998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 11092 bytes

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