Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8bd4ce5b46afbd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 22:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1d04a63f3cd1c13f42ab12496576e32 SHA-1: d6f5a9cdaf328a7ef9d6e1b1265a2b815703b886 SHA-256: ee8bd4ce5b46afbd1a8cab143ff5237fbf9617ef336c62071ebdf6a9f2fd8dc0
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 on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://infrabud.eu/fckpliki/file/fozabekovegenutazapipez.pdf In PDF document text
    • http://nazycakes.com/userfiles/file/10858934499.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/93070788205.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/jelususedop.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/86445083546.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/tenala.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/mevibowegu.pdfIn PDF document text
    • https://msvadba.ru/files/file/dagunulaf.pdfIn PDF document text
    • http://sushi-belovo.ru/files/dolofut.pdfIn PDF document text
    • https://campermagazine.tv/public/file/77555230517.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/neteje.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/97330618023.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/39251308190.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2i2elumdslp3pmd33d87074v85/zovupume.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/3811566935.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/73005205273.pdfIn PDF document text
    • http://pileki.com/imgup/file/lopufuxotof.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/junamonaxime.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/29581164886.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/muporamorovelonifobakatuw.pdfIn PDF document text
    • http://hanshintech.net/data/file/zotedujutijikozufaf.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/86228105542.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/38711329297.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613329ad4c70d---banivudeduniv.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/74746178641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=btd6+unblocked+hackedPDF 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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 10660 bytes
SHA-256: 6b73c6fc99c94b04a41aa88c5c4db2c4aebcab1c40071b01883bb9818ba70ad3
font_01_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 17452 bytes
SHA-256: 5e4b53e976275d4425e2462c0c50b270e1fc013f058f83aefc57fed42773c528

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