Malicious PDF — malware analysis report

Static analysis result for SHA-256 7089a27fa79ce3ca…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 06:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f029f889a7ddee7513e31bc0503d4d1 SHA-1: 14926edeffce0115e108de4c8c667d9c24d6e907 SHA-256: 7089a27fa79ce3ca07c519a98d2785c63814dbee813c40fd01f21e7a62f18c54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed for SEO manipulation, likely to trick users into downloading further malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/bofiputelemadijuz.pdf In PDF document text
    • https://urology-andrology.com/userfiles/file/32730556189.pdfIn PDF document text
    • http://onlinevay.com/upload/files/xusanavoxoki.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090620574173499.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/82450777593.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/99929109055.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/23530853909.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/9160660518.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/waxukigog.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/74177982227.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/10120478921.pdfIn PDF document text
    • https://la-klamm.org/Files/files/dufeliwa.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/varumif.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/55610703006.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/rinotuwixitutokobutobe.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/59781833210.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/nujibibe.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/11479688198.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/28926995143.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/72102480944.pdfIn PDF document text
    • http://exosushi.com/uploads/files/9703061381.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/64387877793.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/13095740962.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3ef9423f8b1b077adcfdb9852183b717/29795157799.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qghcvef0apanu973ra1ri9i4t5/besogibuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+film+deadshotPDF 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_off0000ce73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE73 19728 bytes
SHA-256: 70fe9b6d3555c8cb61f00c9feeb0a5b8bffb110e6a36deec6f7e3910c27906fe
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 10608 bytes
SHA-256: 80ffc3f7350a23052b663c9a22244525b06df666e42aafb5de6b7b3c91ff4317