Malicious PDF — malware analysis report

Static analysis result for SHA-256 84953b58b2311566…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 00:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25283728d2db31b560223fac620f271f SHA-1: 26c06faa2de67b14c5b8a6c78a781bc6cbfd5e5d SHA-256: 84953b58b2311566b93245d5c176fc52e76e5da97fc03af99f725561370fb6c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically identifies it as a link farm. The presence of external URIs suggests the PDF is intended to redirect users to potentially harmful websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cpviettin.com/upload/files/joxukelutugimizoguseve.pdf In PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/29255761696.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5f63a5c26a2ddd89410fef2f329fb0b5/53778327151.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/65652157679.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/donetizuromenoj.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/vevakul.pdfIn PDF document text
    • https://network-italia.com/file/nenipoteditikapaxonexar.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/55095346764.pdfIn PDF document text
    • https://artenika.pl/fck/file/74263382335.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/mitogukupefufenudaxofa.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/90093030064.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/mizomafolebevezi.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210904061218300686iw8dj.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/rojixa.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/xiwogivusuf.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/67088441153.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/69441756717.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a649d48f4---99903830110.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/56904715768.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/zaxejumatisakarewojoxu.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/semunezetutaketemajenif.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/49507315363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dawn+of+war+trainerPDF 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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 10080 bytes
SHA-256: d309df8c58c3a192c3754e8c80f88297f7f47b62da11361923416baeb01b33d7
font_01_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 19016 bytes
SHA-256: 53f32c555247c5904802fc6454334c72b5ef692605351a094c0a5aa56301a2aa
font_02_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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