Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e1d2aa4b8629f9…

MALICIOUS

PDF

94.0 KB Created: 2021-10-07 06:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b56972932ff5e693fc0982a7cf11f483 SHA-1: 4f578e21852783c46a0e02c523e526ecf7ef153f SHA-256: 78e1d2aa4b8629f9ac0c89e18e2610654f00f143e917e62ed721f582812a06c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm 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 the user to one of the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://laborke.ru/uplcv?utm_term=need+for+achievement+theory+of+entrepreneurship PDF link annotation
    • http://teknis.it/userfiles/files/33119569676.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa6af25d3---jatunekevilubexirujuzox.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/29561094762.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1615447d71491d---50204664259.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/22078884168.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/xinopufibapomokosi.pdfIn PDF document text
    • http://signauction.net/userfiles/file/9358589261.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/zoburoxusewukilunafon.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/54566797974.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/43589087147.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/kutofiraviwojidu.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/zegexapabafawafat.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/80969812948.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/gibizid.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/zovapofurexirob.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/98408240424.pdfIn PDF document text
    • https://agt.twwebmarket.com/ckfinder/userfiles/files/nenavi.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/nekuki.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/fimifigidudonadesami.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109281653024776.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/12583900681.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/18322910063.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/litevaxot.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/32130522538.pdfIn PDF document text
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/favetetotas.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_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 11096 bytes
SHA-256: 1336bb8d728a58b476b5ea811884661db77aeabdcd5b1349b2e750c254449c11
font_01_sfnt_off00011e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 20064 bytes
SHA-256: 2d88e563617366a4970c110ac246039946d6bd44c934d396ccdc0b08e88e8238