Malicious PDF — malware analysis report

Static analysis result for SHA-256 feabd53e9f486a56…

MALICIOUS

PDF

73.5 KB Created: 2021-09-24 12:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1dd9f89da0e9c9dd4719a65a27b34611 SHA-1: 1fe2f632e923c98644b79759b3fd5c64ab16e650 SHA-256: feabd53e9f486a5638abdcd12ec2fd500bd6515e23c500836d2b96964a3120bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://ketchas.ru/uplcv?utm_term=data+mining+and+business+analytics+with+r+pdf PDF link annotation
    • https://tradingcall.in/ckfinder/userfiles/files/fiverinigapesefojexe.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/29080354000.pdfIn PDF document text
    • http://vkts.se/userfiles/file/329350886.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/pixufenaxotesorerodu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/374ceb05c8a47d82bf6fd340ce8050ba/jezuja.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/85021307151.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/55704515180.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16307705878455.pdfIn PDF document text
    • http://canoeing.by/pics/files/25809251328.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/64383748793.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210909133040.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/36439636219.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/pelab.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/vibokuropesofegepe.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109012223284204.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/45092980910.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/43362505022.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/31746448426.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/robufa.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161323e6c44e95---mosefapimujijutuvo.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/26218566211.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/pavurovo.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/piwadijosuvetuxadilu.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/4101150274.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nokafiziv.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/82972332.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/fojajipu.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/55879151411.pdfIn PDF document text
    • 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_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 11388 bytes
SHA-256: ee2c29300928d5da8295495df069d7c7e91b4793e0af4a3f52478d07c59e347c
font_01_sfnt_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 17684 bytes
SHA-256: 2bcb5a0ef7396a63dd6259508a71e8f4da6560cbf1023e3f92df80d3f7b5f84c