Malicious PDF — malware analysis report

Static analysis result for SHA-256 e909193e1df4edcd…

MALICIOUS

PDF

98.5 KB Created: 2021-10-18 02:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4db6f5919def0d0e5bfd643000f93d26 SHA-1: 8cfc0b425e5e0bef6687f3b6d96db1d91a270430 SHA-256: e909193e1df4edcd2e44ab7814d4d1b2c9b9d11040c6e35befeb7320395abbfd
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves directing users to a collection of domains, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://prestinieurope.com/userfiles/files/74488436492.pdf In PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/fudise.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/kuwajuwanirulagugadute.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/83099449816.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/86045515978.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zejolakajemugokokotozi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1e27c35a5237741cd4148ec8addc2bc9/685289800.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/66514271374.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/lebilafujawikujewiwoj.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/retapuwapewar.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/95407387264.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/92514230045.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/64212623661.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/93807948906.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/61526185039.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/fipox.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/84751336678.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/lifaselinafi.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/koviw.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/85513557989.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/61459152140.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/xapazudegonorikudisavul.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=frown+in+tagalogPDF 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_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 10048 bytes
SHA-256: ddddaf9f71bd1fc7d452c25bdbd8613efcd56374647371bd45bac91674955802
font_01_sfnt_off00012efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFD 21232 bytes
SHA-256: e318276ef1dc8d3054a0fe70ad27ead66b42fd6cfa2b49cbb63cba36cfb2a5d0
font_02_sfnt_off00016453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1