Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9009febb023905b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 19:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ac6047e21bf6282098653afce349c8b7 SHA-1: b942a6bb316cb38d0e5fa3224ea0f40bac9f1297 SHA-256: f9009febb023905b59245316d53f4e50a55c46a9e1c645bfc93531efe9b7a623
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to domains hosting other PDF files, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or spam campaigns that leverage document files to redirect users to malicious sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lammensfilip.be/uploads/files/74109000743.pdf In PDF document text
    • http://pbhdom.eu/userfiles/file/83674708325.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/62838061244.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3483168202.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/5957625595.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/refiwewesavemile.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/mazugudibatutulekukowuk.pdfIn PDF document text
    • https://razredna-nastava.net/files/bulejoroxurezofixi.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/gorokusejudaporomepisag.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/wejokebolulodudadog.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/bamegumopufekamukifusow.pdfIn PDF document text
    • http://momsystem.ru/public/file/zimetineteneg.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/19045464705.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/gafivorab.pdfIn PDF document text
    • https://bfull.ru/uploads/files/70942584514.pdfIn PDF document text
    • http://gaudi.tw/upload/files/31447991596.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/lubefezo.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/jobepebavigifapasirofik.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/9988098898.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/59856403576.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/jovokasobujixepasefomega.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/417605185613a9e76d9de1.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/6109423471.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/nobivesozaxajarufunujavux.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/vumefirakezujot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=windows+7+ultimate+latestPDF 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 17844 bytes
SHA-256: 70799f0240c5e8e57fdb440e356e94ed6a4f00bb767eddd18422cdd142ef0f24
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 10540 bytes
SHA-256: f98f01fb3a868193ff4dd0c42ad41de395b0132ca81ca0afdefad076bb77daee
font_02_sfnt_off00012264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1