Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f564cd9927c512…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 10:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8505d8e390c97aaea79c6c42258238c SHA-1: 20b897fd6570fdac7407c7a04acf201e96fb9351 SHA-256: 90f564cd9927c5122d980a213d5eae03e7e5fd45ab5e64806b000a67abb4a921
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest an attempt to distribute malicious content or phish users. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hoanggiaphatland.com/uploads/image/files/87360297011.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f3da2a0e36ab1ea683ed65e09fc036d1/96509687092.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/tagesunoxum.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/3503536939.pdfIn PDF document text
    • http://sro52.ru/uploads/files/tusulavazetoxawijapogasi.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/65505147291.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/zopir.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/fowafobufidefosod.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/rejot.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614fdf0905e5b---dijikekefo.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/66723579409.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/kifawufilututulopojazini.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/vunow.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/12707219956.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/74625123854.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/xezafuruwadejugawun.pdfIn PDF document text
    • http://minipit.com/data/files/kadededevo.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/xisodujunowonomulada.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/20590840097.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/pukabex.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/67384018359.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/fujivifevose.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/77579790045.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/silavufamudekuwomijawak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cric+pk+app+downloadPDF 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_off0000b30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30F 10320 bytes
SHA-256: 1d6c7ad56c45481ae39aece3cefb6365199fcd8696f7626bb79b7c65fa485892
font_01_sfnt_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 16152 bytes
SHA-256: 9acea25d3f63ac678d65bf2c4580e4c3ed3bd413cc993713fb3ccb76fa304a0f

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