Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3931c8258d37ab1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 23:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0ee11dbde41816ee0756cf008b0f1dc SHA-1: 677700436090e6a16a3ca0c46ec4342be3c28903 SHA-256: b3931c8258d37ab12e9a4940e2b8497283f1f1b5f995952518577fb230b963dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL distribution are indicative of a malicious document designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://armanetti.com/images/kurubenugipid.pdf In PDF document text
    • https://makanbanyak.net/contents/files/bawavujovakugidaxi.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/giduzegajezusikuga.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeeea6baaa---70656127632.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/22690972224.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/32525615770.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/sakumewu.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/48430163355.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/lqdtqfke292nf8vnk72f9c1od0/90096427221.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/mubafu.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/jojobu.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/rekamoxivadanalubivagu.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/bujukemirumav.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/67911938046.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/povuriminixogujizumapik.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/ziguwulilujinirifu.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/65231112926.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/dalon.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/35541241004.pdfIn PDF document text
    • http://topflexsports.com/uploads/jitagipalijixovuwufod.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/68406778661.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/vopobe.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/kadenugixebodidaxorat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=grand+theft+auto+3+mobile+cheatsPDF 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_off0000b432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB432 11192 bytes
SHA-256: 99e55f46672728506caaaa3a4d78d95eafada96be7f3c6ae1ef0d0cefa697f1d
font_01_sfnt_off0000ce35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE35 17016 bytes
SHA-256: e9abfb5b0be3c75cf6b16a1fe404f43b2425274a702825fad06638b01e5b3fb0
font_02_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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