Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb61fa0d05030aa…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 18:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b7661b0d0c2986dbe773e3b37e11790 SHA-1: 038b751995d5e36a4c7a910860b2c786d3628a08 SHA-256: 1bb61fa0d05030aabe5b6d31b3d060cbb453f210e8b424bd5b814c6a36d50ef4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly support a malicious classification. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=mykkie+injector+v14 PDF link annotation
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kemobaduresewasenesipowaw.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/15150520544.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/13454332915.pdfIn PDF document text
    • http://zeci.nl/im/image/zezopobatisofowewuzobo.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/25985764314.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/zesuxedokatojubovajopemes.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/3141360071.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/66416167897.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/bajaf.pdfIn PDF document text
    • http://bienbao.net/uploads/files/21936458431.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109092120523718.pdfIn PDF document text
    • https://gulamanis.com/contents/files/22988091696.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/87272612919.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/kufimi.pdfIn PDF document text
    • https://ckmandarin.com/uploads/91368168359.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/16956197004.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336d6e0b324---95981229914.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210903160451577.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/79384887301.pdfIn PDF document text
    • https://senegal4d.com/contents/files/kenuxilotub.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/rabowekosesunefudimuf.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/69898186891.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_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 18740 bytes
SHA-256: 557447aad9a6ebb6e9b02e98a602bd909b7cdaecc36190dabb1126ae45d0409d
font_01_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13180 10372 bytes
SHA-256: 9fcca3fe020c7f6260dea3f0865ccec0a2f4f0bb3475bb3791beb1625f1e011a

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