Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ed1cd1d1528213…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 11:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 092f0e9ad48fc7141b467c34746acd31 SHA-1: 9065519dd742f04afde88d5333de201e4ed72438 SHA-256: c0ed1cd1d1528213a352bc0bea6a4af5a5e2c12cf83f283abf1a9a65b614206f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute actions. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to redirect users to a large number of other PDF files hosted on disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the link farm.

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://seattledesis.com/fckeditor/file/xevifu.pdf In PDF document text
    • http://roseeskin.com/userfiles/file/20210922174411.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/kotarobokowutorelaromoda.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/dolotakugukopome.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/6647815455.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/metifujomabu.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/45011909232.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210913083617.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff52f6de48---zegibiduwavotisino.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/43708159865.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/43142731447.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/faxobuxetaf.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/30720882342.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109181754549317.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/86337575992.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/72871868614.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/91668088394.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/rovojuvitezovixob.pdfIn PDF document text
    • https://milkywayads.com/webroot/img/files/86648843858.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/morodowutazegilutitit.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109071330215773.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/talogilafoj.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/95538167189.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/dofikusujogezugolono.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/62856841634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+add+app+icon+to+home+screenPDF 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_off0000cebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBB 18788 bytes
SHA-256: 0fed63c45e463e43e747b57635938e082f3e2a143023b74187af5b5342c2aa0f
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 10716 bytes
SHA-256: 3df8e02603a0b5f30ebeb5421a37dee42ec71b7f2d128d66daaa674b3da6376d
font_02_sfnt_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1