Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd33460fed5f7d0…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 13:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7934cf7101df2b237bd1f3ac8b79ea16 SHA-1: 737572d20f14b911dbe758027702d00490f88926 SHA-256: cdd33460fed5f7d018c9b8af4dd2ba512539d37722b9b04d161172c908163d86
134 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=cool+useful+minecraft+builds PDF link annotation
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/tedilelulifizoma.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/rolopedozomazot.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/bufaresiw.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/73430015410.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/47016293672.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/55560055739.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/66192222851.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/68781726838.pdfIn PDF document text
    • https://lecachet.fr/docs/files/burexesa.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/31811472757.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/43314125964.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xoripexexixuwog.pdfIn PDF document text
    • https://yuktogel.com/contents/files/piputera.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/21365223776.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210903100555_1816529891.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/49117593215.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/fcceb452373813dbe7b1787b88cab889/58067953522.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/21137260636.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161320163e12ec---15845322714.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/mamuresoxozubuzamawusem.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_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 17224 bytes
SHA-256: 5b510086661bc0c7c47968ddffb2f217c0f8506c42b5fe2812b4098755369210
font_01_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 10908 bytes
SHA-256: c4d1f18760ff630d2e8c8b003c6119f34d77b49261d602736664ab1b1a80d028
font_02_sfnt_off0001125e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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