Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8712725785a366f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 09:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fad75ec73d6d5467c235c4ea5b312b04 SHA-1: d4ac1a25138af1c5c62553ca4f330110caf899fb SHA-256: f8712725785a366fdeb7cd39db00eb44690d92a41590eef93a890d75bd1d3f48
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for SEO manipulation or to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 4

  • 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://www.serge-valentin.net/ckfinder/userfiles/files/30965199420.pdf In PDF document text
    • http://carlaschroyen.com/content_docs/61939914409.pdfIn PDF document text
    • http://renknh.com/ckupload/files/92417062303.pdfIn PDF document text
    • https://norservis.info/files/files/26631660735.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/ridelog.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/libudokefobuxamatawot.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210907_2617802AFFCA9378.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/77877398990.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/75061532960.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/65780374712.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/58863996064.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevajugisibuwulelevetu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e760d30468---27944370611.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090720445328.pdfIn PDF document text
    • http://keacg.com/upload/files/15057779866.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vafewimefazukagofumusaru.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/34869661818.pdfIn PDF document text
    • http://anpo.vn/upload/files/19952466353.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/tetalobafisol.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/tageridanubesit.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/tepexixelavawabefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nck+dongle+free+downloadPDF 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_off0000b349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 10448 bytes
SHA-256: 9cce375000205753ee80230d27432582d921c3f8a7137a3450f0affd6d67c865
font_01_sfnt_off0000cb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB02 16300 bytes
SHA-256: 62fef6d1c713b318bd5dfaf95ffa88257ca3e257fd932bf897cb3c5bd3461bde
font_02_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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