Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6a80fafbf122b4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 12:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab1434ea13e52071a4f09c42d07c960c SHA-1: 007e33eb0b63d24f2bcf75e98262f3792dd4b6a4 SHA-256: 4e6a80fafbf122b41592b88a32ff5a50a37c64d64be1398bfa29dce611ee2233
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous external links, many of which point to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 http://nissanotogovap.vn/uploads/images/files/puvugubemalob.pdf In PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/jowojomabelesuwivota.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-16/20210916131723911485.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/bikejovirawi.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/72848168895.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/dodowakelunu.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/80713482295.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/23056169197.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/77375906202.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614761a51bffa---dufinas.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/31155590152.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/18007977990.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/kilimugimuwekidutoj.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/dukodenijulokirewarosa.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/kakerif.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/riwexafufevomirug.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/gasesusatoxuxabak.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/84480259306.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/79406910700.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/wigugutosuferukemixu.pdfIn PDF document text
    • http://princeverma.in/uploads/files/53726671013.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/60355706136.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/dolanadenupozaw.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/44ebb2aa5a388861db9945cdd958dfcc/padifu.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/68440393784.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/9314760076.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/48364548842.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/77393512442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=unturned+fuel+can+idPDF 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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 17884 bytes
SHA-256: 29b1737e09c1399e656d0956e824c7d76c89bf6313fdd271626dec681d4a184c
font_01_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 10288 bytes
SHA-256: 52986ce5d646db5b3cdad2dc5da1a444a941ffe0d314a860120a9160acef3e7f