Malicious PDF — malware analysis report

Static analysis result for SHA-256 88011648c6b27d0e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 12:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4794ad6f130e18148dd390af3e86b3d1 SHA-1: 32475bb98dbd3d0ada1bce006e99377d0c7f6e4e SHA-256: 88011648c6b27d0e574dd1ae22289919b6ca355132a9865fe29ef2a03cc590ec
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 PDF files on potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vedepcuaem.com/luutru/files/jububufevukuxasevuw.pdf In PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210914_BF5B7B8587EF6E03.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/18011178126.pdfIn PDF document text
    • https://led7.ru/file/23827620373.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/vokerapozuzubaluv.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/71769462428.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/53249899666.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cr8pfqurk5qirc9fli4256vmg1/66031921501.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/razizeza.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161333aef79e0d---wifudebekowowum.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/76297106057.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/mezuzojaribamilupikewo.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210908081941.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/55852146471.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/28515442114.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/74646879698.pdfIn PDF document text
    • http://webs123.com/userfiles/file/2375064814.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/71526496965.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/xidova.pdfIn PDF document text
    • http://abc-tel.ru/data/File/70937501537.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/nunotuvamidewifud.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/vojexozel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=excavator+simulator+mod+apkPDF 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_off0000bb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB51 17492 bytes
SHA-256: 38bb3c30c521bfb96ed697ffc8228caad16af4dbbabea9ca3d560bd8f845f9ce
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 10784 bytes
SHA-256: ca2e403e63dd5b0abbad079ef32cb7a452049411263d52fca2eb162282c25c82

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