Malicious PDF — malware analysis report

Static analysis result for SHA-256 298e76c2619d3ae1…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 02:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd4899fa68bbe641fef6595df3115f53 SHA-1: 04053a0e58294e89d99c04fd34183338da5ef082 SHA-256: 298e76c2619d3ae15fd7e5d88937195ad1decc073ce5f5af2b429afa48965390
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users. Heuristics identify it as a link farm on disposable hosting, and ClamAV detects it as a phishing trojan. The embedded JavaScript likely facilitates the redirection to the malicious URLs, contributing to the overall phishing and potential malware distribution scheme.

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://huntic.ru/uplcv?utm_term=famous+computer+games+2020 PDF link annotation
    • http://awarelaxcentrum.cz/user_files/file/83890851344.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/57202145341.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/2688674492.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/jusagidina.pdfIn PDF document text
    • http://salt17.com/userfiles/files/26740125483.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/temoxakosinakususajunig.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/fudemem.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/45593825671.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/37897725643.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/mafupopiwa.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210917172046_2050136775.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/fodawazinebonudolak.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/daninevu.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/xaguson.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/duxekobawelojaxepixo.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/20520096330.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614395baed02f---22674463404.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/bimizopilibewitalago.pdfIn PDF document text
    • http://jngf.cn/files/file/74521937699.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2573736c0c56365e93263e829a78da6/visib.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/13996695822.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/vupaputakelakisox.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_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 17608 bytes
SHA-256: 60be3e746f81f0914d8bb1fd96c4120eac6ace52b0627b96c1be8097f77908c0
font_02_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 10796 bytes
SHA-256: c815eeb048c47ffaa01a699d2ba9f41c388afa83b58b69d5a5bec3fba57d2321

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