Malicious PDF — malware analysis report

Static analysis result for SHA-256 be869338cc0c00ce…

MALICIOUS

PDF

72.9 KB Created: 2021-09-29 04:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2138e49cbf87d677cbdae1ea4a311193 SHA-1: c21140d6ce3dc2f94d3482850a3eac034f3fbd0f SHA-256: be869338cc0c00ce70c646bd956abc22835dc9b2db3ef2e0b4797a426d3b5f96
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links, likely to trick users into downloading further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely responsible for initiating the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garage-fuji.jp/js/upload/files/bigit.pdf In PDF document text
    • https://jagamimpi.info/contents/files/vasejelapinoromuk.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/rezenopusebep.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/pinuvijazata.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/vorutir.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/tuvagafetuvirobuwad.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614b36f4b1de9---82479731449.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/23598070501.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/kobirod.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/37607185787.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/vutoloreteweputerisizi.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/57444791176.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210911042627487.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/noxagewunuwuxasesafad.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/41246851376.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/67810738565.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vetuzuz.pdfIn PDF document text
    • http://podarox.ru/public/files/95200727863.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/45625045598.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210921191059.pdfIn PDF document text
    • https://norservis.com/files/files/wagulewilovovelutigulobuz.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/3513406380.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/20103461336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=stop+music+on+incoming+call+androidPDF 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_off0000b67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 17868 bytes
SHA-256: 03f6c468bc484a2099a0ff5ea24419b889211626cf7a340a867763596dd495c2
font_02_sfnt_off0000fcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD1 10900 bytes
SHA-256: b9f9a669f460e00a9e34f9b11f87204d81c0aa94a2c006d938ab81720df4c041