Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b1df6eb8f4cf1a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-09 07:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce1132f217383f492a13257c93ef2638 SHA-1: de2ef4c111f4cc64b766922e8621f11b18babcb1 SHA-256: 87b1df6eb8f4cf1a66b3174e22f448247c5a05bd9801f25b93cb5a3828d7ea28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially malicious domains, and exhibits characteristics of a link farm designed to redirect users. The PDF structure and embedded content suggest it is used as a lure, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://beautydent.hu/editor_up/39292337130.pdf In PDF document text
    • https://edusfera.pl/upload/file/83963718480.pdfIn PDF document text
    • https://brukspec.pl/upload/file/muzevojorakavutakaxikagoj.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/mesogilomatejelokegepiwos.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/11951802022.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369e706f5df---disapo.pdfIn PDF document text
    • http://lgassociates.in/uploads/51384228098.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/42094023367.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/matopipigiwuwimawefopo.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/57494003616.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/85020858661.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/dixaz.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/25630932285.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/xuvikunevaxadanezokuxijo.pdfIn PDF document text
    • https://edusfera.pl/upload/file/40925662793.pdfIn PDF document text
    • http://3sdent.com/upload/files/larebanujiduzidose.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/4859787362.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/dajaguxedatudim.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/29295138903.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202196347503663.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/terivowinulunesuvaxokes.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134b9a062702---tuzaronolokoruput.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/30256648855.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/pobifufujif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=iphone+bd+price+list+2020PDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/63476594372.pdfIn PDF document text
    • 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_off0000caa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 17460 bytes
SHA-256: f5f04af963602b0c3450e7bae14ccfd4de998e281910eee21e8b1aad32558f35
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 10784 bytes
SHA-256: 9235d77fd6d6ecfe23552a9733962435805eb720dacb4b5ee3b9af82c9ddefc7