Malicious PDF — malware analysis report

Static analysis result for SHA-256 201436b8508de272…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 07:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 928a39e2c332b1b3681eab77a82bba7b SHA-1: fbcc3a2e13857cf5f5baaf2d61ed3fb0d46c48c7 SHA-256: 201436b8508de272ec69c0378eec78989f5971deaeea2586a9e8d4230fbe80dc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to malicious URLs or to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=ps+editing+app+download+for+pc PDF link annotation
    • http://videofilm-tv.ru/content/File/kapuvuvavobasak.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/2796521226.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/11966475760.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/98590254280.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/68510765022.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9fd21788---fogivumovewux.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f79c6b8b---95841993134.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/98983491941.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/14855957300.pdfIn PDF document text
    • https://bliznacite.com/files/zexizasedowazinevur.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/tuxilomedajinerede.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/48280195550.pdfIn PDF document text
    • http://archbot.pl/files/file/darokamazalapewi.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/lobuborevokamilafazori.pdfIn PDF document text
    • https://kueapem.com/contents/files/65726120179.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138896be1a9a---vuxatufusa.pdfIn PDF document text
    • https://csn-alliance.com/data/files/71043368560.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/64573340004.pdfIn PDF document text
    • https://greenways.at/userfiles/file/78515942503.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210907111546605014ofrdpu.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/gaferadefedofotubone.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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 10884 bytes
SHA-256: 28bdf62c67f492041f0833a5d80a3842ae307c87fd553484f522aaa942ce7296
font_01_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 18708 bytes
SHA-256: bdb82f4877dcb26f63cc26d832a4a114cc15fda9d3bf17a1f8f3035baa998eea
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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