Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a89ea6dbba2623c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-13 10:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b8c6bf78d391a323e7d4594c59bfe8b SHA-1: e883b2f0e67d0b6b2e9d18085de2beb66de40695 SHA-256: 6a89ea6dbba2623c201465e634f53772ca1d0ac892556b3166c34aa0ec370005
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous external URIs and is structured as a link farm, with many distinct hosts and links per host, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=lords+mobile+dressing+room+mod+apk PDF link annotation
    • http://sanzmendia.com/userfiles/files/lojunato.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/sanefuzuborisuz.pdfIn PDF document text
    • http://landpas.pl/upload/file/gurirarosevorizebefokuzox.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/bemefivezowupojufobovo.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/rupegijugaxajudumuxo.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/1309668328.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/14989585730.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7bab85d62df74a13e7f5607a46aa33e7/25881943218.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/6345707129.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/79503564732.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/11916795609.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/499435202.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/7331266753.pdfIn PDF document text
    • http://apcmagon.com/userfiles/9477425217.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/16386767871.pdfIn PDF document text
    • https://stopserv.ru/files/file/rewogorux.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/99894971589.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/wotoduka.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/zowumifidubujizo.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/43702160378.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/pemabogu.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/4647152417.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/16eb314ba4fa459f3c1287be13131971/21373119745.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/95287305912.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_off0000bd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD02 17500 bytes
SHA-256: 051f74fb3c32e2c68b36a498a3db225339c79a618edc15890ccc6c110bfe110d
font_01_sfnt_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 10824 bytes
SHA-256: c43e31885c25604eddbcf7f766f5c44f2cd04cb2174fa8559f049c3a866492de
font_02_sfnt_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1