Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda718f275f2b305…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 07:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09526df21dbeaa9e87b27e3d9fd5dded SHA-1: b5764961793ca8ac28a8726dc61841b1dfdc9845 SHA-256: eda718f275f2b3056136e7592b6103be4e699637e1d0f196bdc1c0e8d43d78cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on various domains, suggesting a link farm or distribution point. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of hosting multiple links on disposable domains, consistent with phishing or malware distribution tactics. The embedded JavaScript likely facilitates the execution of malicious actions or the download of further payloads.

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 https://toptenstudy.com/upload/files/BodyFile__613ACC82A1BF7.pdf In PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/31731075224.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/bosukexo.pdfIn PDF document text
    • http://xenangheli.vn/public/files/418266438.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/nojovinaxuluxufa.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/85092585003.pdfIn PDF document text
    • http://hkacca.com/userfiles/14069337214.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/forebisuba.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/vubagosa.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/30162072845.pdfIn PDF document text
    • https://windsbs.biz/files/file/71365020629.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8920352ca---42280863418.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/94340912892.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/koselatenixelum.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/89395759161.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/fasekuduxizumujerewifole.pdfIn PDF document text
    • http://metabolit.ru/files/file/pimik.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xapenovunekukavonifogunoz.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/34833584775.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614219b3a7543---wikeladixebivutokalazare.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/kilelufudapopog.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/lemonadivifubirurodenezol.pdfIn PDF document text
    • http://cold.lt/userfiles/file/jovanajupukedixutowane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+heart+gold+nds+downloadPDF 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_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 18956 bytes
SHA-256: d2eaeea63a3c42934b2a4fd11e83be983721356a99cdcbe0f08f4287f436e1be
font_01_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 10780 bytes
SHA-256: 22b54b693cd65e5683bb36b1e92c86e39a7318beb9b5ce643c3e14032a4e8f91
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1