Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dd1d2631a40804…

MALICIOUS

PDF

68.4 KB Created: 2021-09-09 09:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fc6bf467dedc559f8cc54fbe0e4a7c8 SHA-1: dbfc399f3c753a47bba2f609633830a50def0460 SHA-256: e9dd1d2631a4080445b9334536cb8c7e7671c40d68aacaa61bd15008427b7e44
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to host malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=adjectives+letter+g PDF link annotation
    • http://sweepinstyle.com/userfiles/file/dedejitinifekorapirik.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/876839285.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/lituxetafiporop.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/66475286968.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/52635925635.pdfIn PDF document text
    • https://podimercrm.com/img/files/tamememif.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/zebofotunekasozipelodem.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/18753931378.pdfIn PDF document text
    • https://polandpools.com/contents/files/devoruwo.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/bugelimuregusomogenu.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/jonexakofanemomozudulodu.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/49061069554.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/joxebivatevuvikuj.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/37462704342.pdfIn PDF document text
    • http://stromzeleny.cz/file/30574112971.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/benij.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134230557f6e---duvutusexujilodiw.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/miteloxewa.pdfIn PDF document text
    • http://bakoca.hu/files/file/xudapuzobotoziwi.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kidoxiwanibabuvazi.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/54294390829.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/37634173496.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_off0000b092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 14692 bytes
SHA-256: 0bdab19bfa3ad29daf68ca438ee5f01214e360da0bdb411376aa78ec977001c1
font_01_sfnt_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 10336 bytes
SHA-256: fa776d6350cf733d2905d18fcf73019f226bbef377f0c59accb30abf0949e483

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