Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af865d6b5c38810…

MALICIOUS

PDF

71.0 KB Created: 2021-09-12 01:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18c39e14e1b772b2a00042b3a47b3258 SHA-1: d7cf30556dc8af74ac5536853991c9dc8cac1f3f SHA-256: 0af865d6b5c38810e5bce1991114af8c8d6cfab4b68c57804e3d637ed89b4c04
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://hourinkan.net/js/upload/files/3676732051.pdf In PDF document text
    • https://kuraniterbiye.com/resimler/files/12082510837.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/94542006690.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/zedotumanowuganog.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210906122438_736211633.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/19422335556.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/95829592315.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/biruxivifixu.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/zugasoso.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e60d23672fa669d93edbf3526e8d9a7a/duxulado.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/sedunaliwujosinovumowebe.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/moxaligaf.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/18257071902.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/74888650760.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/zewekelutero.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/54338172171.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/vebigogosobuzo.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/76267565592.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/xawikapezizuzodexunu.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/naxapininelajilil.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/92969057628.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139feb848dc9---75629338590.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///ferevuzotabuzinakafutosev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=five+nights+at+freddy%27s+3+apk+full+versionPDF 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_off0000b0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C6 16588 bytes
SHA-256: 5f32c028c9a6594b1b14dfe92ddffc658a6d840c7ea047011b8d2a2858a584f7
font_01_sfnt_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 11332 bytes
SHA-256: 795aed83ec683c0bec67fd6c5e87d6c3f598591f9e919f03a809a89c1cf6a7ff
font_02_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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