Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47d7d33612beb97…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 19:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8e5c4910737bf64bd3570733545d3ac SHA-1: b30728a110785c79d3f69c30348e32216baa775b SHA-256: b47d7d33612beb97daa6ab03e302052ce1a91875922e771f89cae9c0cba322ab
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=android+auto+not+playing+through+car+speakers PDF link annotation
    • http://albarossa.jp/js/upload/files/79510756436.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/fuparara.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fudilagi.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/37894456528.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/zimazeporufopuluna.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/10285957383.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161450f1f1364e---rirejari.pdfIn PDF document text
    • http://hainfelderteich.at/reguxate.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/9324582116.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/42182761786.pdfIn PDF document text
    • http://boki.hu/editor_up/gatod.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/xapuzuvejul.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/29714625314.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/14827574090.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/xefopisejufu.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/dixofisumabuwakarekew.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/49780457344.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/datubebiberizi.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/savewa.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/15488478993.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/kafizetaxezagirasavigen.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wodojofujowovufododeri.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161387c5997cf8---14453072520.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_off0000afa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BC 11080 bytes
SHA-256: 4814f61d9a3f4d3515b7e6d8c3eb59ccbbe33a79e27e3e3e9b69b923ef54da4c
font_02_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 14788 bytes
SHA-256: eb85f586dfee8aa05dfa8b34df80f2da6901a73f41a2f2bc3852ea921a32ade2

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