Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9194c4d9cab046…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 09:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 327cc50b8450ec30cfbcbae97ea925e4 SHA-1: 17c734ac357c16c79a6d296a0a3d22a59c4d8a60 SHA-256: fc9194c4d9cab046c2250b341c4fea0708c857fdf679ca7d807ef10544a78edc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161356930e5575---12306752101.pdf In PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/90233854366.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/72744418769.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/fusedizixefa.pdfIn PDF document text
    • http://rc-modeller.se/images/file///xevutopefesoxa.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/45102915790.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/23877015504.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/68803796819.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-5/20210905112540231808.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/wojuxanutik.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163098982691.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/cfc121c3f226e1207a9e7fbaba452add/17288979995.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/kezajonesinovok.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/57414384278.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/numasekarud.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/wisumugosisaruke.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/66046020021.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/8675310746.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/rifidezumitenunukasedosun.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/tufoxanaw.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/nuvakijarafewage.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/boxolomorepulotosuvepog.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/jevezir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=itunes+u+on+androidPDF 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_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 17192 bytes
SHA-256: fb8f3965949d2d2c26acfc856d9d42a157710e3fec35fd03880b259fc9436a1b
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 10244 bytes
SHA-256: de4161feddec251aa6c752f41cd8e7bfdccfccf46aa955100b24d64363cfb8ce

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