Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe1d7c106883be6…

MALICIOUS

PDF

73.7 KB Created: 2021-09-20 03:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13e6123ba08093583ad9185f667e161e SHA-1: 78049d68de432923eacdcd21d22039fd10bffb19 SHA-256: ffe1d7c106883be6add0d931af38203a647d3ffc8d51da88ed09c1138a6cf535
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://abwingssuffolk2.com/uploads/files/82399661487.pdf In PDF document text
    • http://pcccmiennam.com/media/ftp/file/paxarixoratijum.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/17748742886.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/feponunisogalapu.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/73100094517.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/toxavoxegamudagutisu.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/fozabevajedivadip.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f032166c1b---goxunetudevep.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/sukive.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/barozojepegirararapebi.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/44465982497.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/paxukatujizakezepudaja.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/nopedugow.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/76828605383.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/wijudegux.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/nufepurujoxoguvisi.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210918080811.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/53924177022.pdfIn PDF document text
    • http://mdtrend.hu/files/file/92846547413.pdfIn PDF document text
    • http://olympusflights.com/files/files/vigomuridasunobotamenete.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/22507518710.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/tabapapetibeve.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/jelur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=splinter+cell+conviction+android+downloadPDF 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_off0000ba3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 10568 bytes
SHA-256: 732912f13888c566cdd0dcf19a9c43c4299225efa00db8ad365f5c9c3879bacb
font_02_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 17952 bytes
SHA-256: 587d0b9b7604d737edd74800cc4f778c007876b7e839466968f1e1629bdf7dd9