Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8189f884687a0c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-24 06:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75c85c4c1d9ce1a823c21af6ebb002e5 SHA-1: 5993715a507c0e56680212ebcc3ba24cf0fa9ab2 SHA-256: de8189f884687a0c05d13666f5dd1d93a39d3319ae1e9907c0c0d284dbaf1349
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://cructi.ru/uplcv?utm_term=android+launcher+keeps+stopping PDF link annotation
    • http://naszymsladem.pl/upload/file/44018613684.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/fanolavaxisag.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/mexowerogilaribebajekuv.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/xawalo.pdfIn PDF document text
    • https://oasis-travel.ro/files/29644439099.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/93624364232.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/64682096307.pdfIn PDF document text
    • http://186086.com/upload/files/94876232018.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/pozuzetawojerejalabokeda.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/juriratexekevatedoza.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/nufalezixifujunufidalonew.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/jijifujudasokixamufupobi.pdfIn PDF document text
    • http://oodow.cn/upload/file/2109130520301022573bu3aglnpyks.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/13024176854.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/gewizalobunebuwozux.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/m7mgkdelf9ouh37fouh13o0l8g/35778201489.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/rifikokuriloviluti.pdfIn PDF document text
    • http://mylead.mandiricareer.net/contents/files/nifiwuputasumeledopad.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/pafirik.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/75606060608.pdfIn PDF document text
    • https://ikima.fr/uploads/file/xilalolifekajekawim.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/81892383548.pdfIn PDF document text
    • http://master-br.ru/img/file/lopuzuveg.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/1674597261.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/40307691762.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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 10964 bytes
SHA-256: 9419ee51fd2bd5b6e890891c0e429a4ad8ffc36becd5f6ce9b0e197b6e6e205f
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 17968 bytes
SHA-256: 68f96c2d7858de413b7b6cbe8566242cafe48387f4f237eddbb3fec26e1f8e7d