Malicious PDF — malware analysis report

Static analysis result for SHA-256 4038762ef1d74565…

MALICIOUS

PDF

69.8 KB Created: 2021-09-16 10:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fed218d73c8fadbdbf826dba6c17301f SHA-1: 443ac8d96da41fab375842aa4742edb8346cd501 SHA-256: 4038762ef1d74565abebb4d0c0f4eb2eeefe61ff98b76b236835b697bae85e4a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm, likely intended to redirect users to malicious sites or download further malware. The presence of numerous unknown URLs supports this, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/xugivizo.pdf In PDF document text
    • http://simp-q.ru/userfiles/file/nezerefufeliwufesojifuj.pdfIn PDF document text
    • https://e-room.co/userfiles/file/tugosubujamipipudexa.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/49201339299.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/xilinilefiwibilibov.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d54f35a3d---fodosirepep.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/rizufuxe.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/68158778933.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/14749186673.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/xojuduziwogegeweremutoru.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/suwinigurunalof.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/jagejidimixewojedupodeses.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/54369893819.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/kamemegebi.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/65077535851.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e63a80508---1752810537.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109071205128608.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109122247006608.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/71914657245.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/84651078602.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219244911684.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/71497449575.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/8634336243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+system+check+codePDF 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_off0000b28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28D 15828 bytes
SHA-256: ce1a8d26c5ee7539656eabdd50dad2cae926ab530a2e6e9905b7d6d55bd64ff2
font_01_sfnt_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 10616 bytes
SHA-256: 5bc2f0026f943be7fc248e0437f690ab14cf5132e0feddce26ba741f80f60552
font_02_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1