Malicious PDF — malware analysis report

Static analysis result for SHA-256 90026147f309f16f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 21:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37796d8cc82ca89d22c268033b5e466e SHA-1: 95d01bb850b75d7373fa16b6280e78fbe9100d09 SHA-256: 90026147f309f16fceb784b22468d2bd0bd7173458f1a96ade70c6088107f7a7
174 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The embedded JavaScript and numerous external URIs suggest an attempt to exploit the user by luring them into installing a browser extension or update, a common tactic for credential theft or malware installation. The document's structure and numerous disposable links indicate a link farm designed to obscure the ultimate payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://pixomot.ru/uplcv?utm_term=how+to+get+rid+of+pop+up+ads+on+my+phone PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d58ff1fb5ff3ae1358480a30fcba00f9/jomotalidusuv.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/97836091784.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/kejixawevevoz.pdfIn PDF document text
    • https://kimcert.org/E/file/kezalepopozulubut.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/21986023626.pdfIn PDF document text
    • http://paradoxine.com/upload/files/95276535710.pdfIn PDF document text
    • https://faceless.me/userfiles/files/85194063404.pdfIn PDF document text
    • https://noventa.cz/media/files/file/77870172369.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/nijuxorumurunebopatazowu.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/namotaketodarelokizawex.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613997deae680---51294877114.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/43581473985.pdfIn PDF document text
    • https://lecachet.fr/docs/files/907983335.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/sikukutomevigukeweminome.pdfIn PDF document text
    • http://htwy.com/upload/file/dajopesefakixak.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/fojiserugepazubalagikojuf.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/9006445030.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/govepegosufurodibavoj.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/gukifobo.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/55426858457.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/wuzudij.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/94651531739.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/pijag.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/33791865856.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/48225665626.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/29875443977.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_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 17624 bytes
SHA-256: 6536360511bde772fa6bbe8325bbb40b9da8cf25d386cec84e6a81edbc0cac3d
font_01_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 11192 bytes
SHA-256: 8dfd13b10ec14c96b20bdf321104ea07fa9db0af75d504e22af43362b76664c4
font_02_sfnt_off000132fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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