Malicious PDF — malware analysis report

Static analysis result for SHA-256 248c4ef79ec6b728…

MALICIOUS

PDF

89.6 KB Created: 2021-10-26 05:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f18a899b6f12738c7952ec393d2ee91 SHA-1: 8b8ceaab92b3e4a6cba382d2b89c7adeae5681ea SHA-256: 248c4ef79ec6b728d3414d936624cc1e0892085fd3ee150c1f335ba5e6045b72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains, and is flagged by ClamAV as a phishing trojan. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of hosting many links on disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 5

  • 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.
  • 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://talaa-obour.net/webmisr/uploadwebmisr/file/zulazipozanob.pdf In PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/kabowakotebegin.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/nipafisi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddde976cb9---tomerojuxututeva.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d358d9415---difetanonefaxesotefogimex.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/vamaxebonemivugamalafug.pdfIn PDF document text
    • https://arhiapp.web-idea.ro/app/webroot/files/userfiles/files/vovokido.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/garovezawevosejewerojojok.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161563d996d42b---95498761620.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/40039072616.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/sinigadifoxagevubo.pdfIn PDF document text
    • https://areicon.com/images/file/38300543812.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/4821112946.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/tituwuridijafo.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/30562325449.pdfIn PDF document text
    • http://sov.tranovice.cz/webpagebuilder/ckfinder/userfiles/files/73582797386.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/gagumakunaz.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/52472919570.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/37728542626.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/zimasepeximozuwire.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/11370041796.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/ditesezafarosoverol.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/zoxulegiziton.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/49408181222.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/logimogafafumalado.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/xizexelabonugob.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=indian+classical+music+onlinePDF 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_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 10384 bytes
SHA-256: c46ae74d7fe5459c90efb94603aeaaa4975ea1e3cb76348f1e7859c4591513ba
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 19152 bytes
SHA-256: e362dd8a7ec6cef198ef518bced279d641e780edc1c9862e1bf1b2c9540ccbeb