Malicious PDF — malware analysis report

Static analysis result for SHA-256 4252ca4c061d3034…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 20:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 553486de36c809312ed0a49e77ad6a8a SHA-1: 2174af478581146391ff727174aaec07a99e2bdb SHA-256: 4252ca4c061d3034a79b061758f9630f952f526b43b317e79d128d5100dc1ebe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to obscure the true destination. No scripts were extracted, but the presence of external links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://wolfgang-photography.com/userfiles/files/danifitibisop.pdf In PDF document text
    • https://buzascsaba.hu/userFiles/file/tupij.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/tidurinarogip.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109252001451442.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/5425978027.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16152b3930f474---fikakulupomulazap.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210919131055.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/xalemakusox.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/xigopawone.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/zumez.pdfIn PDF document text
    • http://1careglobal.com/upload/files/rikadolulixukozuzumugejel.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/74444858751.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/lovokeligafokanidixu.pdfIn PDF document text
    • https://jurad.eu/files/file/kabuz.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/35208178306.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/79951601164.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614338cbc65e5---86567839665.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/68613832875.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/43388209974.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/tilumufonubesufexoninut.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/wogonokem.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///64627443614.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/vetuzuwasawolusate.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tiwuvifusizuxub.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/70501894694.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/22489323254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+calculate+work+done+in+joulesPDF 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_off0000b457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB457 14540 bytes
SHA-256: 0c86948ebce3a4e3271eb3434df81784cfddbc1eb969781f5442724fd80df101
font_01_sfnt_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10764 bytes
SHA-256: 86f9fc63941f5ea3abb097fc87581a99283cd6e7dce3d5a68b9fc0fa07058b33