Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb7c88f07ba9d39…

MALICIOUS

PDF

83.5 KB Created: 2021-10-08 05:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b18109813121a22137a2e56c176690b6 SHA-1: 823688a3b892ff1dd6b4dad98c93a5ca780cee6a SHA-256: edb7c88f07ba9d3974b2e842f3b97c083fd382ddf7ccc907ffa4945e252a9f73
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 hosted on suspicious or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://dernek.daynexdemo.tk/upload/ckfinder/files/19554603201.pdf In PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/wusizoneturoxiwaterisuvim.pdfIn PDF document text
    • https://suksesunited.com/contents/files/80501667480.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/lemugemiremebarul.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/galonirowajozin.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/nabimaj.pdfIn PDF document text
    • http://capableapp.com/uploads/files/sadivilotawipoduk.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/21220300716.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3798d3def8c6e4b541d2fbd38cbd3b20/45134566813.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/84146688530.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/13209070991.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210926045602_8mk1aw.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/39737710633.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/velosiboxotaridima.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/98143254004.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210925153335.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/10972175259.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/14305723063.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/lizepepabobisutixudiw.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/74313559164.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/gorisap.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/lezilajek.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///8192840630.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/92890032632.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/fobevu.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/46339580351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=epson+perfection+4490+photo+user+manualPDF 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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 19664 bytes
SHA-256: f0d060894900f0e56364632c8c630b89e4c76fda2b0d201079aa3c6d0ff1652b
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 11196 bytes
SHA-256: 94f2b79103b3737c4c1ac9bb82ea2d69c0202171a19c4ea1a22984703d965ddc
font_02_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1