Malicious PDF — malware analysis report

Static analysis result for SHA-256 25921a06b1518cba…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 08:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eafaf86a7299f7eb69dbc6404135606e SHA-1: 5bdb3ca3e240257fd8967cf524b266f651758dfe SHA-256: 25921a06b1518cbafdb2cded0da6d8621d432aa55081c7022231aeaee3af057c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings and numerous external URLs suggest this PDF is designed to redirect users to potentially malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=big+games+for+android PDF link annotation
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24946198425.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/57938688222.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/53228908315.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/fogujugomojarometedenevix.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/43006192399.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161433eeb6ed46---tebisurekezujis.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/82053422003.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/zaxew.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/97875516253.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/titoneginexigatakot.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/96555566088.pdfIn PDF document text
    • http://alkanboya.com/files/file///25045024482.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/xuwuzabodizezedekago.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/80453203459.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/nanexegufitenirexanaduze.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/9695165276.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/71347357594.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zupatazikovofuzaz.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/68960483361.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210910151529.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/vagomudanerofabemeniva.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/39679686226.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/4717963458.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/35333140929.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_off0000b0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A1 17704 bytes
SHA-256: c520b5f18efa22733bb426a94609eb328d655cc797be2fbf5ed8c5c8197f99d2
font_01_sfnt_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 10608 bytes
SHA-256: 0cdfe772081ff0bce3d262fe0d5528c80b0135028d3488a950dcdedaecbddb3c