Malicious PDF — malware analysis report

Static analysis result for SHA-256 da82f8afaf7608da…

MALICIOUS

PDF

72.8 KB Created: 2021-09-14 13:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93c48d49eea6f0f3cdcb54c319a83ac6 SHA-1: c2047ffa91b4a3155d417c03026e8e53c112706e SHA-256: da82f8afaf7608da2056ae33bb9c645a90f6db959e3df0d0b9ce3523e1f18275
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URLs, many hosted on potentially disposable domains, suggest a link farm or redirection mechanism designed to lead users to malicious content, likely phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ecohort.com/userfiles/files/momobazuvebujoma.pdf In PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/wetidajotav.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/10778928755.pdfIn PDF document text
    • http://salespate.com/userfiles/file/wavilumi.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/98202684110.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/timugexinekexijewuvoli.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/21627449303.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/30552407328.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/62769648984.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/jipapigizex.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/xodotibomodowogugigikokof.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/rubodurelalivufanatiwajez.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/60542016811.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/92424463612.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/55520854697.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/18806725549.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f013ec3628---12990117900.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/17450797224.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/tamenifopupijilesux.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/fovonuged.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zolovosogilajidijijo.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/lavulapesirewumevireza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+block+urls+on+androidPDF 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_off0000bc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5F 16148 bytes
SHA-256: fd70754056c37ee6edbbac9fe852cd2d040481ef7ca5407c6ca956e24044e409
font_01_sfnt_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 10640 bytes
SHA-256: c0c21f8b2aea3b8069acbec1ebe789a6a7daa6eea2de7087e08ae8be91057949

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