Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fafa53dbb9d0a5…

MALICIOUS

PDF

86.6 KB Created: 2021-09-09 11:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d671dd4a1e4189c1469500249b6b5dd2 SHA-1: ff97ba3ba909a2553dd4bea5d0068f5a9564ba9d SHA-256: b9fafa53dbb9d0a5c98b5cdc73b3fc7e8d2bf38ffb56a0ec99959a05e91e72a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to disposable domains, indicating a link farm or phishing attempt. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution role.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=dnd+5e+falling+damage PDF link annotation
    • http://labonscafe.com/userfiles/6888152405.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/zuterakawenorazil.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/85681189926.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/75917495655.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/xivibunojasefi.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/veduxalodeboborojonanub.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/19704517639.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613066ebb494f---74274523351.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52004531743.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/tixotevumirobugezopaba.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/wutifiropubojomerex.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/55894246543.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/wenotanejedewexogodago.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/tujigelew.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/rosewizininasoso.pdfIn PDF document text
    • http://spakimthi.com/upload/files/derolitatowikikukik.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/liwagijibejolodonatijalo.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/zojisamekazikikivosakaxok.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/gagun.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/disufawifarek.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/bolafuzun.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/boxatuwowuzadixoxizativip.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/80157044027.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133d2cbd4df1---58709402925.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/a2e8484196a564b52369d9df0ef23d24.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_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 10344 bytes
SHA-256: 4e634d40ab6f3d91f37462e14e4b3c7870e5567db5bdc206bbbf15dd783f8b1e
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 18988 bytes
SHA-256: 58f80d996a2ce0f4cdbed4c57c01fbc46685a333139c68f7698b3fcfc2deb482