Malicious PDF — malware analysis report

Static analysis result for SHA-256 10938c8842e8084c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 04:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef59bead3b9954e98d1cd67f53052710 SHA-1: 6469abd2a192939f845e2b6c946e05ea5a5701ca SHA-256: 10938c8842e8084c30b73b6432d6c832a3fe920dd6dd298bee5cfc7abaa74f23
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=graph+paper+a4+printable+pdf PDF link annotation
    • http://allprintusa.com/admin/images/file/79414948057.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210913_111358.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/nebuwaniramuw.pdfIn PDF document text
    • http://potya.com/pamatarabowowoweb.pdfIn PDF document text
    • https://labelmarket.eu/data/file/xopiju.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/ramaxibelofaf.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/gerizijofefidanakazejowuw.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/kerobaloxuwaze.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/66849066430.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/09/77669816854.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/jekudawerufuwojugidoxima.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/33840940865.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ff1d9468389bcacadd0746d633351da/xerulijemuj.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/sekupidiparujobojidena.pdfIn PDF document text
    • http://flirdining.com/uploads/files/texazusapaselututoba.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cc083436---ginarobugigapuri.pdfIn PDF document text
    • http://unseretochter.ch/images/file/divimeverof.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/motavesijigimin.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/vutafiwejifuguxa.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/wojiwusobipakofegefemadap.pdfIn PDF document text
    • https://sapporopools.com/contents/files/13255017528.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/91013165422.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/zipatevevapo.pdfIn PDF document text
    • https://polytex.de/sites/default/files/38086037439.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 17944 bytes
SHA-256: 3107b9916189ff13bd1ebc2c9d681002fa8d9f59e7087286aaf691c81f42e6f2
font_01_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 10564 bytes
SHA-256: 389f12b16b98a315c4036c3d2cc7f39e30c9024492713e8e19689920021cdf5e
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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