Malicious PDF — malware analysis report

Static analysis result for SHA-256 d935843f2a5a5e8b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 01:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aca01c80a9bff79363e5f5f7534fe087 SHA-1: cdcd9b0e5c783f56d42a14e30daecf37d00fbb2b SHA-256: d935843f2a5a5e8b2f4f334d56c0d6d87235eb290f3926c0a978935102513a43
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://kalikraft.com/images/file/57222509098.pdf In PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/vababubetase.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/purowakozewulusotipad.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/3471357844.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/46200334909.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/37630247231.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/kafibifedenegopu.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/50399250993.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/robos.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316bc9818ba---bibibeveweveb.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/92878849677.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/rodawinamuliviragenun.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/dasibukesisazagozifow.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/kenatuvanimefenano.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gutolu.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/71309179225.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/dodipepujujapu.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/30245516387.pdfIn PDF document text
    • http://labradory.pl/file/26498083700.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/noxovukunovoza.pdfIn PDF document text
    • http://secretinvitation.net/images/files/ritowukotamutexokodikez.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/mituwizufesuvapelono.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7af949508---xipapigupareduzevas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fifa+mobile+gems+hackPDF 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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 17452 bytes
SHA-256: 486a55744f14debd232f6ca9832e47a437bfe0cff8c57636a16f6fb66c1fbf48
font_01_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 10692 bytes
SHA-256: 41c1e18b14a39ab3bf1496e6ec34f8ef24d4a428722538bfe79aa9ddba64f0cb

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