Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ddf4805494233f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 09:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3f505da065e7e43ddb39d6dce0baab8 SHA-1: 9f98ca2e3087d3c9437ea735798385690de2e925 SHA-256: b0ddf4805494233f19336aed86ca46458f6b56878dcc09990a996a588aeabbe6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or distributing further malware. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=signal+app+android+apk PDF link annotation
    • http://coomargroup.com/ckfinder/userfiles/files/27602963864.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/1100469977.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/jowetidunarewinu.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/73985195878.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/popuzejexexawolireguxup.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/suvotagoval.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210909013027729152npxgp.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/mizusudozugigezofabug.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/96594783648.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/linupajodorosivoze.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/naponokazab.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/kawiwiwamikobutifugefegi.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/zuzumobajatunepew.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/firufakebomi.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/rejitutobiwek.pdfIn PDF document text
    • https://kaparatt.com/images/File/71944400550.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/53968029097.pdfIn PDF document text
    • http://fruitsad.pl/images/file/bewitarimilekub.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/12715007650.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/tevisivemewuw.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/80092080981.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613759b391304---bukogifobelolugitixol.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135cf521b7da---96166573095.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/38150152488.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/koraxulebokoximopotas.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/jiwuragawumivowagareku.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_off0000ba82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 10336 bytes
SHA-256: 4ecfe8166b0363d70c4e2247b4fe5f0c8a092f94eac9c60a746dbf839a2ddb93
font_02_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 15964 bytes
SHA-256: 0a7289076931dcb8166911e29be57b50ea8625267ae7a37e9ff60770e50c8649