Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbca33d4e4b906e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 04:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 750ebf0d773f97786b42e5968e9c75ee SHA-1: 357f97364767e3e2c590f95e2d822c0b1b8adb96 SHA-256: cdbca33d4e4b906eff370c3e8295b97d57a402106ffabb6ccdefc54aaa8cea31
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to other PDF files hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=download+game+euro+truck+simulator+android PDF link annotation
    • http://dragonera.cn/admin/userfiles/file/jabisalukobuzokimonizor.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/87066640534.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/13394849866.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/35154190379.pdfIn PDF document text
    • https://trexanh.net/upload/files/56639755795.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/temarimile.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/16098891353.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137a2f5a9d77---joremixisidegubulonizimud.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/3647386555.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/17744158581.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/muvajujozunujapipuzulezet.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/dekemukewizamenuz.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/25406806861.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/gisewaru.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/wekopuwitifuzujun.pdfIn PDF document text
    • http://novafish.it/userfiles/files/kodufotasebudusatolotorif.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/beviwe.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/vasisajotuxi.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/78917612787.pdfIn PDF document text
    • http://mylodge-naoshima.com/susojife.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/20523192249.pdfIn PDF document text
    • https://carlojans.com/cms/file/46352205383.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f970d0591---lofumumakejigabaromagav.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/sugejusaluwapus.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/34498105763.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_off0000bc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC69 10992 bytes
SHA-256: e913a3268f5076ab460c805a2e54bf540d9f616cf696c6ba3f9d9d89c9a89cd8
font_01_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 15836 bytes
SHA-256: dd7d231da9ef0e9be9dc0145859a7d05cc96d5f32790df1e22097cc2e7bfbefa