Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75959f2ea74d54c…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 12:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd7cb33b2932885de5a1e3d89131b7c1 SHA-1: 683f98ec4ea2dc365be2281c9aea32f23868ac20 SHA-256: f75959f2ea74d54cfba693fcd45a459156e1758aec440ac891f8994f5907a846
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 and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tuttotop.com/userfiles/files/54556637871.pdf In PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/6412868233.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/varosagug.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/12961767126.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/mewudedimojad.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/34430709229.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438651362c6---27602221027.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/nupolewojat.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/51397256804.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/5623805477.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/kakuziziduwalojojeb.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/vanusamuxeka.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/nebewedisaguvel.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/8faf1b99aeee806106c7a680ecb96741/16656834726.pdfIn PDF document text
    • http://hijoin.hu/editor_up/68389706969.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/dixovuvapiwituramopikegak.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/87585265241.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/23436502086.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/fenixekapiwo.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/jigidijafelajuzeverale.pdfIn PDF document text
    • http://bronia.org/userfiles/file/35934920338.pdfIn PDF document text
    • http://telecycling.org/files/file/fezenixadasupivabekofokiz.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/jixisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fgo+latest+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_off0000b054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB054 15100 bytes
SHA-256: 199c05dcc734ac8a60e89ef348707be7a36595ef8c6df5445144913a597f094c
font_01_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 10200 bytes
SHA-256: 4d1974e5568bb753f666ff5457e2073d0789823c6d12d56f27ecfae9f0d10737
font_02_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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