Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff21190affa5f3d9…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 22:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27a4ae6caf38be2e364695ea4c580c60 SHA-1: 34eefb594bee9eafa0b835d22cf75aa9c8f11de2 SHA-256: ff21190affa5f3d98380f89150b2abf4fb1e9dd200d4dd1c3376c7c4e844811f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many on disposable hosting and using UTM parameters, strongly suggests a phishing or link farm attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://nomylo.ru/uplcv?utm_term=480p+movies+torrent PDF link annotation
    • http://kpotplace.com/uploads/files/vuviputumazubugofovuke.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/98275405092.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/207039893461317e91611dc.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/jaxutunate.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/15117968655.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/62382105266.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/kogote.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/10491676058.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/gijegamubemolemeti.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/76912728022.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/vejisunijezodofa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/278ba4c1cdb8086b7be3ac52d56bad32/26673226732.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/88625899216.pdfIn PDF document text
    • http://hbaoge.com/upload/files/52285105733.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/39532553951.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/vawelakexifol.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/73664090225.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/86588566025.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/95910146425.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/42659944835.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/winufizekov.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/wagajavixi.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/binojowagug.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/fanokuninero.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613985d3cc83f---41903011904.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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 18272 bytes
SHA-256: 907fb103d6267eba4114577363693e3b8ae9ed8e98760895de87a385a89dfb5a
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10580 bytes
SHA-256: 5a56c770603f75bef0b54b881de4a16685a1a3ed7889709cf1d4f092c9741823
font_02_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1