Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84fc0973b24de74…

MALICIOUS

PDF

74.2 KB Created: 2021-09-18 23:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce05d68757b779665ddb6339e0bb3c95 SHA-1: c1a8746a7d0f08bb0be2d4674d3566a8856a2904 SHA-256: b84fc0973b24de748159699732c2c8aa962d09c2791762dc8a0a20da4a87c97d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of it being used as a link farm. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external URLs suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://kiaavcilar.com/upload/ckfinder/files/68528350530.pdf In PDF document text
    • http://artospace.com/pics/file/firalepapeb.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/28541896636.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/wumamowobiremejugita.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiweduxeletuji.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/29262548898.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/73001338699.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/rorevusipigofefimumudika.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/finolirijuzezazujivitasul.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/67186745016.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/24987197033.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/doxetasadeko.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/famiwatebo.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-3/20210903184721781464.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/verebamorinupazofolugexid.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161367fe43c0d5---sadere.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/15760493905.pdfIn PDF document text
    • https://manenshop.com/upload/files/93023320349.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/3277716283.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/bategirapawobeve.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b901d11a94737dc6ab2d784248d29bbb/bulunixaze.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/juzenajupij.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/zerofodebaloboko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rupaul%27s+drag+race+season+7+watch+onlinePDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/vabodotobene.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_off0000bc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC33 17224 bytes
SHA-256: 80dd314ed0f19afd49c6251637886b49659c7b0b124b8e9a8bb9dee667f8e080
font_01_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 11108 bytes
SHA-256: d953510ddf20ac334c997c7eaabdf1ce2e239d1a5bbd0225051ae184d168bc4f