Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa1632f7b9a71ee…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 17:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b911bf5f5d5a601a58745fefd89517b7 SHA-1: 284e90917b4badc3bdd23ec2cd8b2af2ba447208 SHA-256: 9aa1632f7b9a71eec6376a6cbffaf75494f4e60a4fbefa6b54c79733bd04d126
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pistant.ru/uplcv?utm_term=yts+the+official+home+of+yify PDF link annotation
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/vovujelurifegawojuk.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/99268039142.pdfIn PDF document text
    • http://dalba.net/other_files/File/90151227256.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jowuzotigosupolonuwojop.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xikugekijumaratimesubem.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/mijobotejawijujewedejo.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210905132152_pkkzs8.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/93211543581.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/16624220734.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161369a59ba119---67893866071.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/kemavafovefaten.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/wuguzu.pdfIn PDF document text
    • https://asken.as/bilder/file/naguvesikeb.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/debibuwodubi.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/91141484413.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/47737943163.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/diluzoxoponifexo.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/50107696085.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/84731064352.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/pumifobokitiluvixobera.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/85022695655.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/zumupubovokudo.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/foberexagizupakinopasafad.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/39006042484.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/kuzodexujalavapivepixarij.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/98683138862.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_off0000c3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F9 18464 bytes
SHA-256: 7d42c52da9cbc8f7e806d7affce90fe0c5dcf2bab41441418f22b627c09239b5
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 10492 bytes
SHA-256: 41dd105ae36f71a1981775fdf79be1e510a4d542368b927dc4d14f446cc8ba21
font_02_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1