Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abdb7785f8f59b7…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 12:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4f11046edec037898f3661ffc5517a6 SHA-1: ee1a0992e00950971fc4746a718f4a841efa27bf SHA-256: 3abdb7785f8f59b7c646e5a8e9a0c3ffa3a42b4984ce8bdf1d0590b530daeb98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. No scripts were extracted, but the overall structure and URL distribution point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613395a497b58---89287678040.pdf In PDF document text
    • http://hoteldanang.vn/uploads/images/files/39111637905.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/50469035365.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/pikisirunitoxifovoliva.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/58292667166.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/16716936014.pdfIn PDF document text
    • http://pneusmarene.it/images/file/suwezisikewagif.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/16875962602.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/zepulud.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613315a7dbcab---bekuzopumubumomev.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/xoredok.pdfIn PDF document text
    • http://santeh.md/img/files/ninaxu.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/lusadojegizogozaja.pdfIn PDF document text
    • https://norservis.cz/files/files/xaxoliziru.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/saxolejosuvefigudi.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/33770286306.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/jedagana.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/musifibutikuwiwasovopara.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/16988172146.pdfIn PDF document text
    • http://gekon.net/userfiles/file/73636356620.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/93829557660.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/rimuvuxu.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/66236652210.pdfIn PDF document text
    • https://buyafranchise.org/files/files/morumewewobezizanilo.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/48566419973.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/luxozuligazewisix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dokkan+battle+jp+iosPDF 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_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 19052 bytes
SHA-256: 007c9b6a2fdd7354aa0931ea9a4928bbcc1bb06a7896cc5b57f99e75181bcd8b
font_01_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 10508 bytes
SHA-256: dc5432a04a6c72934cd3c006413e3e30bef7c6b35fe826a37a31422f39f84170