Malicious PDF — malware analysis report

Static analysis result for SHA-256 6490dec24565c324…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 16:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6deccca0026641c6d1ba3838c96eff24 SHA-1: fbe7ae6d951c4270fbc798f77e6b73a666c1a0a1 SHA-256: 6490dec24565c3240c5447a1d0a0fb9f53030d51440602128f9b9c995d773c0f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links, many pointing to disposable domains, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nic-irq.com/userfiles/files/pupegodil.pdf In PDF document text
    • http://skiflogistics.ru/userfiles/file/sotofexurijure.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109041651345778.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/gamudigifizawe.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210902_234523.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109020730455677.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/diruresotuzazenox.pdfIn PDF document text
    • http://klpa.net/userData/board/file/niralanelisixiwefufixaju.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/74476328996.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/lebulesal.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/migoxugekak.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613968950070d---suboziferobanosivosajiti.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/wuzanudomevosi.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/9129646484.pdfIn PDF document text
    • http://linker-apps.com/files/koxalawubemofukefoge.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/pogitubuvuxobafebagadulu.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/90714850301.pdfIn PDF document text
    • http://whatdwellswithin.com/file/jedupavakipamiturekawe.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb2edc985---kexusedurukiselozuti.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/51939690828.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/giwabolororatozotibi.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/24591159510.pdfIn PDF document text
    • http://signauction.net/userfiles/file/31845766957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rastreador+celular+android+gratisPDF 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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 18228 bytes
SHA-256: a739ee983844ef836748456cc33423d87f12a9ae20ecf1f3ed365bad3ff06971
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 10692 bytes
SHA-256: a9418a4ffb687dfdb44901ad6310fdd31eff90e3250438c538bac53b032fc775