Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea83d2896109aa8…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 10:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 527b2499a5b1af24c02023cec2dcb75a SHA-1: 72130f246ed394300b68d60da8a61541e98281d1 SHA-256: 2ea83d2896109aa8e860a331dbf16e83dac3c8c23a452db030dc28940ff484cc
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and heuristics indicate it is a social-engineering lure, specifically prompting the user to install a browser extension or update. This is a common tactic to facilitate credential theft or malware installation. The embedded JavaScript likely plays a role in executing the malicious payload or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/55643565581.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d09ecd6a---94044814478.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/pumalebakezaxegijamarik.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/garafasedokoter.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/golekotibupofumukafat.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/44419857810.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/96484941450.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/loroxixudurorasusapomotev.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/zerajapirudeni.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210905_052921.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/84511464275.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/27000215278.pdfIn PDF document text
    • https://cet.sk/res/file/nudosemezuvigojoriwikib.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109091920219029.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/zopelalitogewisidejosup.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/rivelarexebewusa.pdfIn PDF document text
    • http://nhabe.com.vn/ckfinder/userfiles/files/89206434367.pdfIn PDF document text
    • https://grandegroup.net/files/31265189072.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/saxapamaxomafovubew.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210913_C5C6B60B88DA5513.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/zoxalamebateru.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ff1d8b8b80ca242b6a25eaef5996e13e/32896538318.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/30776532118.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/2641ed67cd8d212782dcee5cd2f7b3b2.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/fuzipovubarigomovosose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=app+not+installed+nba+2k20PDF link annotation
    • 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_off0000c17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17E 16560 bytes
SHA-256: 28b4159c374fb6ec6eb8037f11cbcce6a78a80b9d47682d162479e45a3c65b06
font_01_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 10740 bytes
SHA-256: 3bdaf3458e78f9e4d3245169f531721246e9dabf30c22f61511f3a482579e042