Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd26466e504d4d73…

MALICIOUS

PDF

91.4 KB Created: 2021-10-10 16:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9ae1707f6fecea8c4209964dd43a8310 SHA-1: 8682e54b93c4cd4f0f229a090cc551b207452a96 SHA-256: bd26466e504d4d7383eab2d10490c82be4afbc3c1b6f25ed3afe6ae936a9cc28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through redirects and link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=standard+twisted+pair+cable PDF link annotation
    • https://hygradeinsulators.com/images/uploads/file/bokijavekufuxuginoreturoz.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8f7e62633105abee86aeb12ee63fe675/bepimopupumumebimasodedu.pdfIn PDF document text
    • https://temahr.hr/files/50132089782.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba7e01b5d---69778588916.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/ragifivowugevesax.pdfIn PDF document text
    • https://e-room.co/userfiles/file/xilesabedakusiwa.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/wifidonivi.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/30653887106.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/wamutawokukosi.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/14449148951.pdfIn PDF document text
    • https://hotelcorona.ro/files/zaxemujidobodoriz.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109131031577221.pdfIn PDF document text
    • http://dalaichau.com/files/72673979227.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/83584133076.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/samivokalisusotili.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/51314493092.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/22175092559.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/67076949939.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/mejositusajavinumi.pdfIn PDF document text
    • http://rentaruedas.com/files/others/67747320758.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/67211509969.pdfIn PDF document text
    • http://chinazzjx.com/d/files/bagete.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/xazukat.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_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 19332 bytes
SHA-256: bd8785deea62db9750883c83261c422fb28e4e9fc137d962ea35ad76bac2b54f
font_01_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147ED 10688 bytes
SHA-256: 3b190acaea4ab556cff4b05f4e000a516c81d55e3a6052c226eec8e14af057ee

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