Malicious PDF — malware analysis report

Static analysis result for SHA-256 835d9050692e847f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 05:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62a5d873075ce24af8461b2e766fb336 SHA-1: 6ffbf410f2e59137565aff018edb73d717a6b1ae SHA-256: 835d9050692e847f3ce36c8f9d821bba66ccf2ddbb04e042408ad05d3d9a4d27
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with many pointing to unknown or potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, suggesting a link farm or phishing infrastructure. ClamAV detection and ML classification strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://silatur.com/js/ckfinder/userfiles/files/56040086122.pdf In PDF document text
    • http://designerhouse.ru/upload/files/besikin.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/331e25bd9b14a3f2680927134364c7eb/pesodowafatasa.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/faripixu.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/47981368225.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/40148758792.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/95053478674.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/dimipu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139068b3b86b---tojabonafubixis.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903191352.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/71678845822.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/99095875820.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/pojazimatezukaxageri.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/13822255061.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/33156484576.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/28185338166.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/nirodikozibavide.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/35057469824.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/7286997552.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210912123528.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/87943903376.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/vuzilibudofejazalar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pretty+pretty+please+by+pinkPDF 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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 10472 bytes
SHA-256: 6eb150db6e5f9092bf28c2d9e4ae97693ec98aa8a81d071dc5a0a86769a49036
font_02_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 17864 bytes
SHA-256: dd0db0ae51983af27e3e5daae93eee929c95b798d83f62be298385978a9a21a2

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