Malicious PDF — malware analysis report

Static analysis result for SHA-256 18292dfc7de6108a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 00:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77032dac1a5137ae5c98f26780433ae0 SHA-1: ccfe48ca4d1862319453f224c846b1e092e4c873 SHA-256: 18292dfc7de6108a729f646680ac0a8d17afc8036da392a3cea3c2030cf3f46a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. 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 exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=snapseed+photo+editing+download PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613372ef20023---76339609013.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/jebukiw.pdfIn PDF document text
    • http://lagrupacio.cat/file/femizaxawerejezafasoda.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/58210875921.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/jigusoniz.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/53742766409.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/gubisisopizexaroket.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/xejobinagokujolevogoja.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/komebusujok.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/tozoratelipiramodegar.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/11095831534.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/14297925094.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/kabusowifivakepeda.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/79138773056.pdfIn PDF document text
    • https://soechi.com/userfiles/file/63840387731.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/46399700185.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a836f8464e04d41bfcf97f1cddb9fc4d/lejinomoni.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/jabapidizofeduduz.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/relemelafewepo.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/galim.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/dejepuxitet.pdfIn PDF document text
    • http://pk.mo/userfiles/file/masaduxavefiwuxosarejewa.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/11997444313.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/kebafitojigaw.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/tetinagexo.pdfIn PDF document text
    • http://355353.ru/userfiles/file/pixipuwulidusiwawa.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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 18436 bytes
SHA-256: 62345bbc2d1af0454b04cfa923c510d6fb7ca759e5c814f0bf10f5b588a2c26c
font_01_sfnt_off00011771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 10732 bytes
SHA-256: 4bcbfd7bd1fd648e9e1e01dedb9f3c0352623f60fdac6186c2dd16d54dc11af5
font_02_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1