Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bf0c90576ec0b8…

MALICIOUS

PDF

296.7 KB Created: 2022-06-05 16:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 8137da0bad02a9206cc090214e8f73e0 SHA-1: e19f8d53e590c7ec02d5182a34a0935ed5ddfb06 SHA-256: d6bf0c90576ec0b8b050f6bbc6880985f7b0d715ce8c1139a12fb5e24b688f4a
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high-confidence heuristic indicates it is a phishing lure using an SEO redirector. The primary URL, https://sunuf.co.za/XSRYdR1H, is likely used to redirect the user to a malicious site, potentially for credential harvesting or further malware delivery. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6289

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://sunuf.co.za/XSRYdR1H?utm_term=factor+quema+grasa+pdf+descargar+gratis+descargar PDF link annotation
    • https://doublehaircenter.com/upload/ckfinder/files/22337052898.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/purugemuwekesafuv.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/1265333618.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/r9fo6ujqij23b7no7efb10iu89/nezolopevif.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/5967356988.pdfIn PDF document text
    • http://dns1.lineshare.net/upload/files/20220505091817.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/rorufirokirodixafepifi.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/65298627543.pdfIn PDF document text
    • https://baduninenivogov.weebly.com/uploads/1/3/4/5/134589003/8747147.pdfIn PDF document text
    • https://badevejolaf.weebly.com/uploads/1/3/4/8/134867981/lebepinijibiwo_jebojegusiwanul_wosesixij_zowenatije.pdfIn PDF document text
    • https://komojagalon.weebly.com/uploads/1/3/4/8/134885500/laxawananuwaxum.pdfIn PDF document text
    • http://www.forsheda.se/admin/kcfinder/upload/files/dibijexakutib.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/lutugijuzujopisek.pdfIn PDF document text
    • https://surjyamgroup.com/ckeditor/upload/files/23953352021.pdfIn PDF document text
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/tujabe_kaxebavewewi_najibes.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/dovegudoliwa.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/88170225.pdfIn PDF document text
    • http://gira-classix.su/kcfinder/upload/files/67588483932.pdfIn PDF document text
    • https://rozulotefuvope.weebly.com/uploads/1/4/1/4/141429736/zukiwunudarazu-desumibobel-sumafixi-xolobalupilaxi.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/jamigurovemaxikiwisarege.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/85909091642.pdfIn PDF document text
    • https://mipixapotorifa.weebly.com/uploads/1/3/0/9/130969355/c798bf43da35.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/bivelopotigekeki.pdfIn PDF document text
    • https://garagagu.weebly.com/uploads/1/3/4/3/134364865/midute.pdfIn PDF document text
    • https://semopuwelonime.weebly.com/uploads/1/3/1/8/131856984/zupipowomuri_zuxoboveri_muzepo_vozagoges.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/31659847098.pdfIn PDF document text
    • https://gekojivigi.weebly.com/uploads/1/3/1/0/131070255/8640860.pdfIn PDF document text
    • http://groupeao.com/app/webroot/js/kcfinder/upload/files/kezoz.pdfIn PDF document text
    • http://smartbazar.online/app/webroot/upload/files/78032641750.pdfIn PDF document text
    • https://kevadogat.weebly.com/uploads/1/4/1/4/141435236/4394314.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_off000425a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x425A2 11036 bytes
SHA-256: 2e2fcc01357805debc8e9d1ba518063954ae3b024e9968a0746d254272dd93ed
font_01_sfnt_off00043ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000456f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x456F3 22628 bytes
SHA-256: b28ac53a2ccd3b4fb616dc51760461d552927900c9b110cecc534e8590c8047d