Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f0e78ae0b071c8…

MALICIOUS

PDF

89.0 KB Created: 2021-09-14 13:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 018a8f13f4bd1825982b236cc75509fb SHA-1: abf44fbaaaf3d3b6807793d200ea6c63db48a80c SHA-256: 63f0e78ae0b071c851346c919ce5dd22cf9254044922bda1c8235f801b59c156
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://pradakshinam.com/fck_uploads/file/zenoko.pdf In PDF document text
    • http://etcpremium.com/userfiles/files/66242127253.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/bubure.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/64504878125.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/94990891021.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/piwadijosuvetuxadilu.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/60108752773.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1a5a68c6---12855403717.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/88487913830.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/xuguxisukijemo.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/mawavafufi.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/6585622376.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/fekadoruroxi.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/lirukejavelux.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109120128175000.pdfIn PDF document text
    • https://songhong.info/userfiles/file/53615242137.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/72873090447.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/83163809512.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/tabenoni.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/93408740774.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/bavetavufek.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353ae496b29---pifanufenedawoze.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/kanaxolotobobo.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/riditilovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+coco+full+movie+onlinePDF 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_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 10492 bytes
SHA-256: c35ab3bb10b673d20ab9f285c7cd718c3e12f977d91b5102738269e2d274a705
font_01_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 17520 bytes
SHA-256: 3865775d27250d38ad659525f1b74daf6fdd15cb6d445f2a6f7b2259168cbfde
font_02_sfnt_off00013e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1