Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b564bcb9929ce1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 01:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b1e31069a9afbe831b52d0d806ed74f SHA-1: 97879650659485b874c110f55f0c0b814cdec5f8 SHA-256: d4b564bcb9929ce18e904a8fb8890e326751b184ae36f2b15bde92884f2705d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to potentially disposable domains, strongly suggests a phishing or credential harvesting campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://falconshipping-uae.com/userfiles/files/ruzawosisadifo.pdf In PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/kagigarajozusu.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/46046525937.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/pawotovivupaf.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369f0bd5665---xoziso.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/sigirafomaxos.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/furevizanodenaserozox.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/66878623299.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/71809320495.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/wivafe.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/wukituk.pdfIn PDF document text
    • http://pasaru.com/upload/files/tajamixiter.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/20190863319.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/30342536570.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/10448121486.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/44757061441.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/65135780432.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/81222980944.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/83330822928.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/wuxarafoliganiraluzote.pdfIn PDF document text
    • https://birudongker.com/contents/files/16968862726.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/64434431763.pdfIn PDF document text
    • http://npas.ru/pic/file/28353785443.pdfIn PDF document text
    • http://manenshop.com/upload/files/46171324604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=login+login+microsoftonlinePDF 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_off0000b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 10472 bytes
SHA-256: e441610d64e6338d04f20c9320a94c8fcda2bc2135e47869e48064af3bd7d1d6
font_01_sfnt_off0000cdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC1 14948 bytes
SHA-256: e8479bfd0fbc2956d773ec0abe85adfa9c296eb8a749993070e13d62f533a61d
font_02_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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