Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39643a54615f77d…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 08:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 274fd245fb987b44831cf89e46c3eabb SHA-1: fc19317f83daadcd543b819f7b5378e98d0ac83e SHA-256: b39643a54615f77d968b8e5aca61631b3fef5756a20a437c2d08d7d0d8afbf49
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of an embedded JavaScript stream indicates potential for further malicious actions, such as downloading additional payloads or redirecting the user to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=jesus+the+resurrection+of+the+messiah
    • http://navigator-nsk.ru/userfiles/file/50330751507.pdf
    • http://fixafilm.se/userfiles/file/wedakufef.pdf
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/zuvipowuj.pdf
    • http://msslink.ru/userfiles/files/venomanimi.pdf
    • http://cp-1.ru/userfiles/files/jubomidofebunedetili.pdf
    • http://strandedtattoo.com/file/16566729961.pdf
    • http://covina.crazyrockinsushi.com/uploads/files/84685939199.pdf
    • https://ww150007.linebot.net/upfile/files/20210923224346.pdf
    • http://nuk-amro.de/userfiles/file/rejeboruvenumogewoli.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/35cc7d7b52523e3ef67845c7746e76dc/51980104615.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f095921331---zizebejutezajemon.pdf
    • https://vsetinrally.cz/userfiles/file/takukejagasuzukeripifiwi.pdf
    • https://clubselect.ro/ckfinder/userfiles/files/42762253394.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/14004709557.pdf
    • http://nicenpos.com/userData/board/file/gedobo.pdf
    • http://www.medic-pneumolog.ro/fisiere/file/84867217160.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/13321507919.pdf
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/2292705796.pdf
    • http://bukhatirhomes.com/userfiles/file/40280129901.pdf
    • http://tjsyjdq.com/v15/Upload/file/202191924464965.pdf
    • http://murielbellhomes.com/userfiles/files/23029814283.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/58865040980.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_off0000ad68.bin
3cab3241fca52b63b786512a801fe575aa1bf33cffb759f621254590b22c6976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD68 10648 bytes
font_01_sfnt_off0000c5ab.bin
21655edef87d70c9ac1e5e7280c8c7e4694bf1002e767366e752d33befb6ffcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AB 15944 bytes
font_02_sfnt_off0000edf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 16792 bytes

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