Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e5734301a15dbb…

MALICIOUS

PDF

81.5 KB Created: 2021-10-11 12:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e8c466a6bb1355119a0ccd81233d56b4 SHA-1: 76343f89cf79f1d36653452321c3fb7ba72ad7a4 SHA-256: a6e5734301a15dbb229a4b1036d6791d4f748cdc28dd1cc0f65dd8515c1c11da
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm of disposable websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a common tactic of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=skin+care+specialty+physicians PDF link annotation
    • http://kfoodntea.com/dataroom/file/tixuladoxeki.pdfIn PDF document text
    • http://robbes.nl/media/files/44940120979.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/ragadodumuzuz.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/48284826464.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/96485140025.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/16372901370.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/zemaxitazavamud.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159e17f32600---lojiginokisumisebom.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/37700789880.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/76369500584.pdfIn PDF document text
    • http://www.520amis.com/upload/files/pewamisigud.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/94498933730.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/91636514484.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/xofipikezimaru.pdfIn PDF document text
    • http://jngf.cn/files/file/32401018414.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/xobutawobunifabonel.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161476e77b3f9c---48320240911.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/buzokogokokeduladozagokof.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/9703068930.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/sizixagaje.pdfIn PDF document text
    • https://tekstilkent.formenemlak.com/upload/ckfinder/files/5879600311.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/vojepilujiwisuwufi.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/reguvexudogipagevilegepol.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/78819182917.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_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10632 bytes
SHA-256: 7f4d7e60a9e635bd1c400f67369cf495d88bf3e47c5a4c9a7048545fae2c485a
font_02_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 17308 bytes
SHA-256: ac8b05cbe2e24a7676ad40b6ef389390125f5eaf7086c11f4a5db08c45b9df47