Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1c273a362b8768…

MALICIOUS

PDF

79.2 KB Created: 2021-07-20 09:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 813464465dce20664024277e0a87ae62 SHA-1: 94c5f99f785f8c70cbc2d04eef2906986e3c13eb SHA-256: 3b1c273a362b8768102b77ca09f133566f766bee4a1ff707a36d00d31c67c55a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains embedded URLs that point to external resources, suggesting it is used to redirect users. The presence of PDF-specific heuristics indicates it exploits PDF structures to achieve its malicious aims, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8666

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/~3/1LSSs5qy-i4/square?utm_term=pdf+put+together+one+file
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e95c8b0d544b6d71994/1626111637418/nudivaboz.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f520760b174908922331c6/1626677366918/79589193781.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f5af4e9443b979a15e585a/1626713934642/ux_design_powerpoint_template_free.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f10f49d1d8e65aae85b81a/1626410825684/the_huns_are_coming.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f4ba2b731d8c7c6f0d58ad/1626651179628/good_morning_beauty_images.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec93c11951226b8b8c2dfe/1626117057481/dijibimorububaf.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f5fc266db83f336ef38a84/1626733606637/79788994224.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_off0000d4fd.bin
dc96acece97d4710d027898705a836c3422099893df76e4d8ddac5c51770b08a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 16848 bytes
font_01_sfnt_off0001012c.bin
9c4a23985040792a4079c7dcb517eca0579225195524941cf2aa9113c6aef00e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 10548 bytes
font_02_sfnt_off000118df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 16792 bytes

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