Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36c5e2415fd7316…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 09:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9761e0aea03830291eb996b5f35abc48 SHA-1: bd22c30a1b8bee1f36fbc218e5837637d77841ad SHA-256: e36c5e2415fd7316fdadb7c803ad25a6e2d14a702f68848b093e26f2fdf6d08a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification indicate a malicious intent to redirect users, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.brickchamber.com/ckfinder/userfiles/files/levikekug.pdf In PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/93341260084.pdfIn PDF document text
    • http://leeandrewdavison.com/download/94278564243.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/kafodilonizadojuvak.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/kovuv.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe83286733---jinuxuwikititujoroloj.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/42420840139.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/11169990805.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/jiluxumogokalobelejuzu.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/88887628406.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/40285466160.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/letavunodefi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcc1c4e38---mutokutamujimawal.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/69040116640.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/fivesago.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/43872669346.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/noxutazidufebudukifisipi.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/dukixijewobutegasigu.pdfIn PDF document text
    • http://palami.by/images/file/48779901290.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/46789647974.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/27456226644.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/vafobif.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/31249022551.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109131910273453.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vobadu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021913103357007.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/54493395852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=toxicwap+tv+series+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_off0000b9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D0 10828 bytes
SHA-256: 15840603b4906a8f423848b9e744ae6d46ff050ab4b857a7c0ecf52fbb77747f
font_01_sfnt_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 16212 bytes
SHA-256: 6e4630dc37ceb142877e98bf1a3d015a8062ee43aab95ab7762ea74e67a22319