Malicious PDF — malware analysis report

Static analysis result for SHA-256 82241f62180fd7a2…

MALICIOUS

PDF

75.1 KB Created: 2021-09-25 18:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 87bf75a5a6921cd02eb063d1d1907566 SHA-1: 3d6f2cfb72a91be0fd315878dd5c736c23f7063c SHA-256: 82241f62180fd7a2b3502b596c12610324fa8c44448166e23d0128f5720b65ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to suspicious domains, indicating a phishing or malware distribution attempt. The PDF structure suggests it's a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nomylo.ru/uplcv?utm_term=snake+eyes+2022 PDF link annotation
    • http://biplano.eu/userfiles/files/39307664146.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/taguvuxozunufijeti.pdfIn PDF document text
    • https://coil.hk/upload/files/bewipaveb.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/kabetal.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/lisixasim.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/99212611342.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/8135374569.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/aac2cbbb34834a141e36017c615e6584/37606646622.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/putewexiderunibetotubaleg.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/46601202220.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/duwakago.pdfIn PDF document text
    • http://whygzy.com/Media/Uploads/files/89296096767.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/tejasojugafi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/43657887540.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/75434415206.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/4453016946.pdfIn PDF document text
    • https://matratva.in/userfiles/file/kigafo.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/sodojiluxugarebugifixomab.pdfIn PDF document text
    • https://conrays.ru/f/data/80657364492.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/33932262447.pdfIn PDF document text
    • https://foulardfotografando.it/file/sokadomujojoteduxaweja.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/58361030156.pdfIn PDF document text
    • https://bawauang.com/contents/files/13226032508.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d87d02ac8---dusekizufulopirobav.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/fuxoxemaletejikazivune.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_off0000bdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCB 19312 bytes
SHA-256: e440361b6c9a91484dda2cfc164bfeca17a902782eb028c08402641c950efc08
font_01_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 10168 bytes
SHA-256: 1041cb5d497fc4e766d2329ebdf4e418a2c809756bd5e252c2a143f578c9ee1c

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