Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea1f430165ae502…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 13:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5baf64772ac3186f37c16facb2d26fbf SHA-1: de9349e8a8eb7ac92e54328140e14cc2bbf818af SHA-256: fea1f430165ae50279ae802b57eb5f358ca23e4082f993d7287ad8fa760ddcd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF, indicating it's likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=best+gps+spoofer+android
    • http://lineshare.net/upload/files/20210905235654.pdf
    • http://kimhoatra.com/upload/fckimagesfile/tokijosezibiwijav.pdf
    • http://movitecnic.fr/ressource/site-image/files/84640637773.pdf
    • http://s-privod.ru/userfiles/file/lasure.pdf
    • http://londonjip.com/userData/board/file/65027534121.pdf
    • http://avanti-kuhni.ru/upload/files/dugopapujozox.pdf
    • http://linpus.com/app/webroot/userfiles/files/32281231387.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19b449120---vurunofesixesogeraluwo.pdf
    • http://tangiahoang.vn/Images_upload/files/wilotapureper.pdf
    • http://langeline.com/ckeditor/upload/files/50494514601.pdf
    • https://trompis-tondschungel.de/userfiles/file/buzepefupirekaxo.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6c1bccf622b4890442ebdb734ed56562/rakaxabenagolagemebe.pdf
    • https://muguet.fr/sites/default/files/file/bavipokadoxabedododevozaw.pdf
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/goxeja.pdf
    • http://bienchidan.org/uploads/files/55903932405.pdf
    • https://stw-nowogard.pl/download/file/guwagevanes.pdf
    • http://iccjsc.vn/images/uploads/files/97011185319.pdf
    • http://www.galiantsolutions.com/emailimages/file/zojafezifapa.pdf
    • https://drivetripper.com/userfiles2020/files/1450941584.pdf
    • https://siroyensao.com/upload/files/12273605976.pdf
    • http://www.cerel.eu/images/wyswig_images/file/fijiro.pdf
    • https://guapa2.com/admin/fck/file/lumezamemina.pdf
    • http://lawngo.net/fckfiles/nufegosunidevaki.pdf
    • https://e-ssuances.com/ckfinder/userfiles/files/visamejewilujazimosu.pdf
    • https://uleshuzatabc.hu/files/file/9289909199.pdf
    • http://lifeline-sports.com/files/file/fikamazoxo.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_off0000d0d8.bin
fa3e30904c9adf728785b3033939e4de559dd01ff574e0f3bd2ef91f1983184d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 10680 bytes
font_01_sfnt_off0000e94f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 16792 bytes
font_02_sfnt_off00010161.bin
049f6175e97dc45e3b214eddcffe1fae809b5b6e4abbcfb5f2f60d7ec94efebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 17336 bytes

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