Malicious PDF — malware analysis report

Static analysis result for SHA-256 1733df881f520038…

MALICIOUS

PDF

69.8 KB Created: 2021-09-10 03:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d3ed17fc93ef2f5b0e35bcd54b1becc SHA-1: 9c998efb80cd2fa67ddf6ad3fc7a9077e368b3a1 SHA-256: 1733df881f52003854ae182028c38a16b5b3be7e77857ddca19a96d156290d62
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the 'SE_PASSWORD_ARCHIVE_LURE' indicate a common phishing tactic where users are directed to download an archive, likely containing malware, after being presented with a password. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=windows+phone+link PDF link annotation
    • https://thucphamtruongxanh.com/Upload/files/kodinusasimazujonevejuz.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/10836283194.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/31045316443.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/37766625828.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/xisesozipurimigobase.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/94048966658.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/tabup.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/xukabetomuboki.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333cd276ebb---matudura.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/4811019803.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/1290790033.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/7300727128.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/kadubome.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/25321629031.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/rabupijegogesasoxogisofod.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/rofuxilerusovopagebojipu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d750b67ff---76668473716.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kemosukalumajewaduzan.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/4995523688.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/gapujiwowuziwuvufixi.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/wuladamejepepekisudanap.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/fakawoxato.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/21782243400.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/lejazolawejuvinuku.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/venidaxelupawiz.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/49190275506.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/botabonutivulot.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_off0000b596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB596 14704 bytes
SHA-256: a2b54a21f6d493a397d4d63d3a81ff03569f6fa219ba51cb07b8887fe0d308c8
font_01_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 10300 bytes
SHA-256: 67c123e32567f71a57c34df5b8063787abeb8268040a5ad323160cb552433446
font_02_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1