Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e96c3f0e5ec4efe…

MALICIOUS

PDF

76.3 KB Created: 2021-09-23 04:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd70f531505af62372374bc4028b9004 SHA-1: 909bd911798b45462828dd343dec4fc90558579b SHA-256: 8e96c3f0e5ec4efe0597aaf33cf3d1513de0f203f2d9110c289d9443bb3045ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to malicious sites, likely for phishing or further payload delivery.

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 https://noithatkuongthinh.com/uploads/files/18574614845.pdf In PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/duguwojisobenuxenumujejir.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/dedorepu.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/boxesasezisifofi.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/66802216044.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/selegokafilikidipubejifid.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/xumukasemajejipufoperiva.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pehietjto1f3uvmu7q4eqtqaqj/defivudo.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/mafipavuwidila.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/2094637805.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/turusujalelasovoxaliwo.pdfIn PDF document text
    • http://humanlitech.com/files/files/10767074688.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/29955321637.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/16592534085.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/buzopezazogexo.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/rekuxodi.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/tirito.pdfIn PDF document text
    • http://mayjack.com/upload/files/jifumedamosumofujetidiko.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/83668808781.pdfIn PDF document text
    • http://irinabailey.com/upload/files/31949981610.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/23527767710.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/wexoxokirujunof.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/41780297811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+strategy+game+pc+2021PDF 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_off0000c577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 17200 bytes
SHA-256: 7e346343b391a034730126d05b047094102b9aea1409bb1132f125ca1d4ee514
font_02_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 10816 bytes
SHA-256: 61a2cde31ecc20e0d56ce64e9548f45a766d09d7cdc8f110120c4b7d354173ab

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