Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a9893af15f7e03…

MALICIOUS

PDF

86.8 KB Created: 2021-09-11 23:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b2e287763b2b52907f056b36c39891f SHA-1: b22e7ca1b36c021bce68caa8a7a24a86e4863dab SHA-256: d6a9893af15f7e03c637763d3e75b2fd1916714fe54099a4231bd7064dd0a677
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting sites, indicative of a link farm designed to host malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=things+you+should+do+in+minecraft PDF link annotation
    • http://flightshop.jp/images/blog/file/megeseluwarejupefi.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/75101313597.pdfIn PDF document text
    • https://shevian.com/images/file/jewun.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/jimirovagogagaxami.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/12028940195.pdfIn PDF document text
    • http://mamitobe.ru/files/file/60256296042.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/57518758140.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44be889b1---39898346707.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/javawo.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109044851_239730008.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/65990012215.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zisawosamop.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/dakemokosidagorofale.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/dewufakureguso.pdfIn PDF document text
    • http://orthodoxnews.us/file/mimekonidisubefimawuwojal.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/pasoridazizeruzejuzofuf.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/tekasudojamotak.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/mejulawoketugugugiberopob.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/67032134398.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138199c0a0e0---36588805439.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210911211947.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/85883549815.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_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 11100 bytes
SHA-256: 766289ed8c92aea6c4a263788da15a519ce42bc14960059d62ae9a288fe9636f
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 17372 bytes
SHA-256: 020418ed3126affd7f2bdfe59e3570fb1a4c1c0da3e34897f5cf9093736e884f
font_02_sfnt_off00013573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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