Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a81206761939f5…

MALICIOUS

PDF

77.7 KB Created: 2021-09-26 12:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2891d034a0044708a90f0ebe769a1a66 SHA-1: 6cb640f49d6c1c564d29edd562fe9420dbe3a319 SHA-256: d0a81206761939f593c601ae732308ed30959e95d2bd994bde8764469dce6a85
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 http://myshopgroup.com/userfiles/files/85156874318.pdf
    • http://ottotech.center/userfiles/file/poxefufoliwawureditamider.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/duxefijudixubijobixago.pdf
    • http://yidaig.com/uploadfile/file/20210913055957.pdf
    • http://ipai-bg.eu/img/file/jutawenidifadevawe.pdf
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/nobamorag.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/zukikaxik.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/15b0031c99db116b0d690af81ab09b8d/zofogiziwunizofupu.pdf
    • https://aksukartela.com/images_upload/files/1493110131.pdf
    • http://s4l.vn/storage/ckfinder/files/buzepipivabudajizafaxemob.pdf
    • http://sahcarpets.com/userfiles/file/91174508233.pdf
    • http://denki-shonan.com/uploadsfile/wunubisojepolaxugusajaf.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161403b1a7ec47---85250892494.pdf
    • http://kleinschaden-expert.de/userfiles/file/xudawuvaloxuwexafalel.pdf
    • https://floridagreatescape.com/media/file/xanevapuvafoxaxo.pdf
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/lufalewor.pdf
    • http://elai.kz/upload/2021/09files/2109240248158741640da0c.pdf
    • http://maimungkorn.com/UserFiles/file/gimaruzoto.pdf
    • https://aynadakikemalizm.com/resimler/files/97761633547.pdf
    • https://crownprolaw.com/userfiles/Proj_Name/files/63265877086.pdf
    • http://kammerchor-lindau.com/file/51708021126.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=naruto+final+mod+apk+free+download
    • https://b2cdemo.tickets.com/content/files/vitenogosexilemonop.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b38e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB38E 16792 bytes
font_01_sfnt_off0000cb9f.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9F 16232 bytes
font_02_sfnt_off0000e174.bin
5869b9f09ae4b8d85b85bbebef477b25d9d3a3e9edf693220bea413206c52786		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 18236 bytes
font_03_sfnt_off00010fbe.bin
07e7f661e1f46702887ededc9b6116120ba215bb983a0f3f90abb917039ea863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 10748 bytes

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