Malicious PDF — malware analysis report

Static analysis result for SHA-256 725b3070e5e25239…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 05:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9059eea4b5af3e24f0605e6e0b90fd28 SHA-1: c47c30a37baf3dc4849d51ea63e80e913622418b SHA-256: 725b3070e5e252392a99cae5782c581d879f4d94bbe3429a2f07f46b9a87bdd3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate malicious intent, including a high ML score and ClamAV detection as a phishing trojan. The sample also functions as a link farm, directing users to numerous external URLs, one of which is `https://catamma.ru/uplcv?utm_term=watch+the+good+dinosaur+123movies`, suggesting a lure to potentially malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=watch+the+good+dinosaur+123movies
    • http://sm.ac.th/ckfinder/userfiles/files/88336323251.pdf
    • http://fgosvo.ru/files/files/55981498802.pdf
    • https://dukupahit.com/contents/files/gexotogiwibotew.pdf
    • https://thehouseconcert.com/ckfinder/userfiles/files/91794189419.pdf
    • http://www.sudaff.com/pics/file/sebuxoxanewenakad.pdf
    • https://idroilektriki.gr/files/file/xovadigoxowige.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ddf96ac8f---zazaluxagewaxunimopugi.pdf
    • http://i-p-p-c.com/ckfinder/userfiles/files/66718504927.pdf
    • http://wangyiphk.com/userfiles/32197406861.pdf
    • https://pristineleather.com/userfiles/file/bojowifel.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/jojekep.pdf
    • http://innova-perila.ru/upload/files/rerevigo.pdf
    • https://htchninc.com/d/files/82513546693.pdf
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/zepimepakusud.pdf
    • http://graficaeformazione.it/userfiles/file/voxejarumujamovoziz.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/89574509172.pdf
    • http://capitaldanceacademy.com/userfiles/files/minixedotikevitizeraves.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210906_6276F9D88CDE9C01.pdf
    • http://euromarkcreations.com/new/fck_img/file/nikulajederekarop.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cc654e736df86ef7de7ee92c81d1b1bb/95346144367.pdf
    • http://tuivaivietnam.com/uploads/files/46990252285.pdf
    • https://alajuusa.ee/media/contents/file/5102120398.pdf
    • https://padservhosting.com/userfiles/file/mepususo.pdf
    • https://konzolstudio.ro/uploaded_files/file/wurufamevetuwobes.pdf
    • http://droneducational.com/admin/userfiles/file/pidimi.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_off0000bbae.bin
3c5ceaf2bf8f4f267d7029b590a0378009defb187df1da844ec732a0ad428803		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAE 11272 bytes
font_01_sfnt_off0000d5f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 16792 bytes
font_02_sfnt_off0000ee09.bin
98e141fd18cfcfbc070dbb7ded3c4febf6d40e7feebe39857605398756e96b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 17528 bytes

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