Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30e6e85e702fd7d…

MALICIOUS

PDF

102.6 KB Created: 2021-10-07 16:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2c204fbb60d252b65e78490a3c3dad3c SHA-1: a313638e549e3db4398321b753501c81b385f50b SHA-256: b30e6e85e702fd7dcd5dcd3ec26d35830eda06d91ec99e4af9e00551e9a4fd81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://loxocongnghiep.com/MINH/user_files/file/lenuw.pdf In PDF document text
    • http://cyclad.org/UserFiles/file/molubatopidokabamubapew.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/sokefixe.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0a5c544dc---vowolononovulemo.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/38915814961.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/rokojim.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/lamokuvir.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/59700309814.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b88423f0c8---11258324123.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/nemaxa.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/tilaluvazufokefoxosuli.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/buberedogokupub.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/wabidipezobenexofolud.pdfIn PDF document text
    • http://santeh.md/img/files/diwigizoxizepuvelasoxoker.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/57160805526.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/zuveki.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/22574551370.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/24390157624.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/famofokokider.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/tawelojuxopurusigakebugaj.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/tepetixa.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/riluges.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/89007492581.pdfIn PDF document text
    • https://phr4u.com/files/pujiritotaratatafonos.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/fowom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=simplify+square+root+of+150PDF 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_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 20976 bytes
SHA-256: 509528fa7e7999d0beda309af6ee342f2873583746098300f4e81d7100ccbf79
font_01_sfnt_off00015a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000172ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172AC 11160 bytes
SHA-256: 22cf25c9f44d0919760987514848b41ac1e1cb0a107da3c9755f7dad5ed1dc6b