Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0fd4f5101c111e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 01:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f92a720985acae92cb863d5af7cfdea SHA-1: 4121fbe5e1c59333f8f49e6b1efb6b55435ea1a3 SHA-256: 5b0fd4f5101c111eb15253896cd11b9f2f3ddc4388567d29b79ab64f09813c4c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of links, many of which point to other PDF files hosted on disposable domains. This behavior is indicative of a link farm designed to obscure the ultimate destination and potentially deliver malware. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/85002318584.pdf In PDF document text
    • http://klenderbio.com/upload/files/lajuxuxanorazadiremog.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/vabalusepixifadixu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/91602302356.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/detefajadoterunumezegagob.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/42766267752.pdfIn PDF document text
    • https://medtek.vn/storage/file/xudedamidapivuj.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9319196482.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d003f178c4fc1813bb5fed5c2563418/26479966550.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/dutanubam.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210904065313.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/33645323658.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/82960077696.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/30838486391.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01167e695---68224379770.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/lumewomov.pdfIn PDF document text
    • http://msiutilities.biz/documents/lanedefebew.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/3446073889.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/zefal.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/vodorewizomogudanek.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/56531613750.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/navubaduvugekif.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/setolivusapegujazadujam.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/16878185337.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/tilajupiruzedovibexapufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=police+car+chase+apkPDF 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_off0000b80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80E 16496 bytes
SHA-256: 6c6b538502b4fa71dcd74de3ef054b70a7ce4fa22b6a7e15716651d24447d0ea
font_01_sfnt_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 10364 bytes
SHA-256: a08572bc3b54473b432c1f9b7452bb6ce2586553469bea5cf10e32eb06a0a526