Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4b3e45459cea5d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-16 18:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 55467c9a426dc55624fd1a0e4392b158 SHA-1: db859990fd2b0e93c6a82b539cb2448fcfb0f713 SHA-256: 7b4b3e45459cea5da1834ae961cbfe96c3c6ab6f7ed2895413a360451e41901a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous 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 malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://inruho.ru/ckfinder/userfiles/files/52967703425.pdf In PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/bolexiradewir.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/kivuxifogozesemusetar.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/milubasodotetepa.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/waniradosobasumegebubi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0d3ad5217---lafomemurogurebajelegomov.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/26045cf9956bc2d02b4924ec19fd2920/jewejodixulopema.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/80263545677.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090909210373499.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/xigegon.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/pewawakigutixeji.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/karugikonugofok.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/36638128733.pdfIn PDF document text
    • http://prmakeup.com/Image/files/tupib.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210913_697A8BFB2B316B45.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/kaxajotokijakijudeva.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/womixotexogemugifurod.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/56738125654.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/160527519645.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/laguvaje.pdfIn PDF document text
    • http://etkenkalip.com/files/rizamakibas.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/96735019527.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/giradipowujaxo.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/12152517460.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/60881679563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mobdro+offline+2021PDF 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_off0000bb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5F 16172 bytes
SHA-256: 0d81bd4c0d2a1159d442a33fafe0d5fd141725aa7d329e176e293fd940d3556d
font_01_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 10344 bytes
SHA-256: 7bd0a6dab8f38614ffeaf20e66d81efbc90df77ce32d4c9e8c2db440eb81be84