Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9af5588a0daee4…

MALICIOUS

PDF

77.1 KB Created: 2021-07-20 12:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b397e9ce10491140daa24fa6f614d0d SHA-1: eccdfb24f1b9483dc76fe4fba8f111c6d7c46ef8 SHA-256: db9af5588a0daee4ddd5297ee6ef84ef8a675abe4470f62723088d2eab980b68
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a specific ClamAV detection name indicating it's a phishing trojan. An external URI pointing to 'archism.ru' was extracted, which is likely the malicious destination. The PDF structure and embedded objects suggest it's designed to exploit PDF viewers or trick users into visiting the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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://archism.ru/square?utm_term=the+age+of+adaline+streaming+vf+complet
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1a9304df8fb288cd983a0/1626450224980/23756403429.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f66dca5f306a537f7a1e1c/1626762698321/which_of_the_following_is_not_a_concurrent_power.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec79dc760c9e2bcf420fc5/1626110428834/how_to_get_free_battle_points_in_mobile_legends.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f622da3fb69e7128f2af9c/1626743514304/jomixamutonugilujatow.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f4fdb2731d8c7c6f11407f/1626668466402/does_a_sea_turtle_have_fins.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_off0000c876.bin
1d7d509705a8b4866b9868b70eadd877c9609c55e7846209c4427150ed4a5ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC876 11096 bytes
font_01_sfnt_off0000e1f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 16792 bytes
font_02_sfnt_off0000fa09.bin
a4193060bc506f7d525d652aa521f1d2800a619c823852e41a6f3a1b56203c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 17732 bytes

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