Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf4f4ff0cdd5249…

MALICIOUS

PDF

97.3 KB Created: 2021-09-24 00:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 97feb8d6b2f83a348cd4848e6287e058 SHA-1: f16d32e204b86d3201d4dc1ebe76fbfd0600212b SHA-256: 9bf4f4ff0cdd5249fe9080c02e3accdf74223a7f597c6c6aa0e551207b2b39bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery. No scripts were extracted, but the overall pattern points to a malicious document designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://economiadecomunion.com/ckfinder/userfiles/files/femesoxamegaxediremubar.pdf In PDF document text
    • http://ytlcases.com/userfiles/file/ditidibiloxofegiwinegag.pdfIn PDF document text
    • http://mylodge-naoshima.com/foxaludagobu.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210905_6A12D3D6211079B6.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/43863531708.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/jusukabaxif.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/zariwakedovovumedovij.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/fesojatukobisufepadutagas.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/67359325234.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/xomulukavezalepifazur.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614900e440119---33648203836.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/guvadamukonivonovogizig.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/jokunotilusaxas.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fevitutejozexusotekebupu.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/69457017979.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/81803158461.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/nigebigi.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/20485646091.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/79228584164.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/29c54858df7f2adcb26cf2b38bd79f8d/nixedobapixonekarudawax.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/mibibikedotanoxusavev.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/vorukifodadeno.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/69190052692.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/niretunofiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+words+starting+with+nPDF 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_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 10620 bytes
SHA-256: 5f770716b7e650a35cc51c303d2457d1626af2090bb240357ab7f8b876621f0b
font_02_sfnt_off00014909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14909 18148 bytes
SHA-256: 1abba701a23066dc2114819275e7bc0b188a7b296189279708a5aba59331b269

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