Malicious PDF — malware analysis report

Static analysis result for SHA-256 1797164c8145a51c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 15:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6edd8224652a48d4635084110538e7be SHA-1: 3bc224e673b01e535df6aa3882de2ea0a5f3ecf6 SHA-256: 1797164c8145a51c1411eaa732bac90534c235ccf5205379082678aaa1fc7054
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing JavaScript actions and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code, likely to redirect the user to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://oniceh.ru/uplcv?utm_term=button+bar+apk PDF link annotation
    • http://wamer.org/userfiles/file/92811360001.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/97364602001.pdfIn PDF document text
    • https://2acontractor.it/images/file/wixef.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/3426454503.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/52034457948.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/kilaputowiruzivonuzil.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/33690632845.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/15993607098.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/30936787906.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141e624ea5f5---nadat.pdfIn PDF document text
    • https://alpinashop.bg/files/woreweso.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/39096861394.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/63374768090.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/15066466322.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/15090791645.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/gepaluselevusadowidetigo.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/selino.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/jixinakitujago.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/63166629125.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/b7l97412behvrbnutk0j0rfja3/12541654834.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/69021589070.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/munumokapir.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/kewuvalalero.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_off0000b35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 18832 bytes
SHA-256: 481d9098530e5335d6d065087af343190a7d0e3530e4447efce547c6447c5266
font_02_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 10192 bytes
SHA-256: 8730336199e376f543259e8ea268100fea13351cd32c595b58051f7d199501b8

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