Malicious PDF — malware analysis report

Static analysis result for SHA-256 91194882d3681900…

MALICIOUS

PDF

74.5 KB Created: 2021-09-28 22:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcec9bf70852dd062b261c8bbae733a0 SHA-1: 5cffd69ded17d21c2a8fe1e59022e64b1cf4a7b4 SHA-256: 91194882d3681900b63810371940270f6ff27f44a99948508aca9e8e8fddfe4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files on distinct domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://spodne-pradlo-2bpoint.sk/UserFiles/File/wobodakovamozibeku.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/sotaz.pdf
    • http://ballarioarchitetti.eu/userfiles/files/48912319079.pdf
    • http://tabouligrill.com/ckfinder/userfiles/files/nogowikadomedidarawele.pdf
    • http://taihegas.com/filespath/files/20210925214748.pdf
    • http://www.ecostroyservis.ru/File/goxamilakotaje.pdf
    • http://softwaretesting.kr/club/data/userfiles/file/20210909084721.pdf
    • https://www.opsclown.it/ckfinder/userfiles/files/siropovabe.pdf
    • http://ride-on-earth.com/images/blog/file/moxumidovibapevovafug.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3bb14a8c331874c082316b504ceefcc/niwanejuxobuxugugidiwa.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/58f466f81a6dd028c7c493d56d4ab951/duvedozu.pdf
    • http://faptvmedia.com/userfiles/file/guniteguzogavafivowatox.pdf
    • http://yoron.net/up/files/xupunijutuwute.pdf
    • http://npas.ru/pic/file/25180267115.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/rasupu.pdf
    • https://noihoithanhtuan.com/media/ftp/file/71831194695.pdf
    • http://www.bash.cl/media/file/pifavaju.pdf
    • https://kenhquangcao.vn/uploads/files/suzizerazasipedorubo.pdf
    • http://brenderup.ro/mm/file/12197774484.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/fijegipo.pdf
    • https://mogilew.ru/userfiles/file/xuvapinufijibenenifi.pdf
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/xesamegemax.pdf
    • http://www.bash.cl/media/file/wasolub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=subtracting+fractions+with+borrowing+worksheets+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b937.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB937 16792 bytes
font_01_sfnt_off0000d14e.bin
575a5950588111be46f259dc373d02d41409f35f8e7f6e53a50d65c1698bb00b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD14E 11344 bytes
font_02_sfnt_off0000eb9d.bin
4045b081b9d7af0dd3287f3a1cd11450c65cc8b65a0ab1f57a8561a87966ebbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 18540 bytes

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