Malicious PDF — malware analysis report

Static analysis result for SHA-256 1edca635959a77c8…

MALICIOUS

PDF

74.7 KB Created: 2021-09-27 20:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e36dddd0542454fefb352fa4a1d11ecd SHA-1: bfa40e43d1bad2a926cb6d7f154f2ab720d89cf2 SHA-256: 1edca635959a77c8d656c04f200517f9b7188413aa52ddca06433dc646ca0372
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript (T1059.007) suggests an attempt to exploit vulnerabilities or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://hotspot-usa.com/js/upload/files/94622297428.pdf In PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/42486260058.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/dataxidowaxiberirit.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/tanoduxewosadopi.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/zikubaluxuzizofi.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/gutito.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210925_d43cf.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/vulebusizememobuzezo.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/xigepuvodowerusakulemef.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/farirabalafij.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/45574971265.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/17788115333.pdfIn PDF document text
    • http://dc-8aaac82755d3.breakthroughwell.com/userfiles/files/12340597145.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/19271236158.pdfIn PDF document text
    • http://4darchitecture.org/img/all/nodidomamakapokebosiwora.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/wedapadutejeg.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/3647720570.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109171336146888.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/watepuzupepali.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/xepazifutesibep.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f24f84b282---tiwufidarini.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/72899378345.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/40698845630.pdfIn PDF document text
    • http://metapolar.hu/tmp/xipaninixinebopifikeged.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/sitotanibazovebabesotuvon.pdfIn PDF document text
    • https://artemishosp-em.tw/uploads/files/202109220236455825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=castle+of+illusion+mod+apkPDF 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_off0000bee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 10780 bytes
SHA-256: 9d3849934c1c2e247828f476982d1f731005c8a5fde5df76dbdf1a8e1b7e6a29
font_02_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 17700 bytes
SHA-256: 744efff14c152a648a95608e018f13abbfb361e4bf62646fa055f69bfa656907