Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b13241da67ad2c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 01:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae80cae0ac068becadd5fa6515a98141 SHA-1: ca83fc9d4206242670d6920986a4c147a6eab2a8 SHA-256: e3b13241da67ad2c659cd57750ec8d23d2b148fc1c59fdd701703219c73bbeb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF acts as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://auxerretv.com/content/public/file/wobutubezaporozomuf.pdf In PDF document text
    • http://ltptech.vn/uploads/userfiles/file/pegivitifuf.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/91330094376.pdfIn PDF document text
    • https://kaisar168.com/contents/files/vitozi.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/pijepevefifuxu.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109010538479140.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/16529824166.pdfIn PDF document text
    • https://majubesar.net/contents/files/fupew.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/76102102517.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/fopiwuvi.pdfIn PDF document text
    • https://ccskin.com/geektic/files/defiro.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/11/4815509840.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/zotoralab.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/89992624869.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/pemaguzetaxuxujubamejam.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/m6q96sae34u9393r2b2dbm1thi/dejexugaxilodewos.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/1993633089.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6da092693---pufowifiriruba.pdfIn PDF document text
    • http://med-os.com/user_upload/file/witedoba.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/vupoma.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/75533359406.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/matanepirede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bambukat+full+movie+download+hd+1080p+free+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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 17544 bytes
SHA-256: ee870b0abb113b4eb444196062f884a5439c636b72fb80b839592901b94b5a69
font_02_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 11516 bytes
SHA-256: 1ff5bdc6f4cce6a4464b58b9a07fea630991e30057aad97e4bef985411560119

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