Malicious PDF — malware analysis report

Static analysis result for SHA-256 800ebb97513eba2b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 01:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 754c11b81aa36e356447dd681f991eb3 SHA-1: ec6f82e8d734fc14fb37f06b0db8f301f0ea79cc SHA-256: 800ebb97513eba2b889f711b8f228400c4245ab881fa02ea0a3536be2f1131cf
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojanized document. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://ktmcollege.org/public_html/userfiles/file/87495937819.pdf In PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/780827358.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c66eeabe9---27083368441.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210902134717.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-2/20210902044844106997.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/riwavagofifiwak.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/nodoki.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/fajafapukeku.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/xofekoxijunon.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3bdb049be---6584824794.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/motolukonaminajixopokuv.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/mowadegujinosotemimetot.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/28345574497.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/30957363136.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/xatuninuliduno.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/daxexozagasewazisidep.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/46230570275.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631304020.pdfIn PDF document text
    • http://skene.es/userfiles/file/bapakomened.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/60703093284.pdfIn PDF document text
    • http://hla.vn/upload/files/64791179318.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/69737980732.pdfIn PDF document text
    • https://servicepapik.ro/files/57326995764.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/pipezetizanila.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/gudularitebenib.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/nugere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+your+home+screen+a+live+videoPDF 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_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 17424 bytes
SHA-256: 3c4d506c57cff88df4c50096319432a54da0400b15ddafb71d14826a66c3a162
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 11084 bytes
SHA-256: 740ae785dab7e5661594d7d1583dbfd17e526819e240f8085a51b9844f8df3b9
font_02_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1