Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c923a7a6080ff9f…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 03:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d19430df8dc8145c4d9a7a532b03bc53 SHA-1: 46bff410aebf7065f4b9e73f7757e08e80e2eb4c SHA-256: 5c923a7a6080ff9fe21c75e23f0e43debcb81ef67f6303542a10d570405c373c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous links pointing to disposable domains, suggesting an attempt to obscure the ultimate destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kqcme.yiaiwang.com.cn/upload/files/gosezusalivupaniwugito.pdf In PDF document text
    • http://jjw-led.com/userfiles/file/kekakakenakaz.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/82014268451.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346ce0ed72e---70671678003.pdfIn PDF document text
    • http://builderall.info/userfiles/file/98843923011.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/48546596880.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/62928052684.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/95455851306.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/98456005740.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/dabobobajodozimurudovisen.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/60804563661.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/77365882765.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/likita.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/kixazejekajotofum.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/pobafuwevixilivobu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e6a195ce---zojiginepuxapivunukofoti.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/wemipofufenunigubojex.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/bijokagimozijupet.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/26004223384.pdfIn PDF document text
    • https://fasleh.net/Files/files/rawedutofe.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/45922497405.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/59923942776.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090413215565.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/marimazimagapat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+android+x86+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_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 10792 bytes
SHA-256: ca76f095dc44463669607b0204d147818b4f7786fe8dd655d00f1bd37044df06
font_01_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 17748 bytes
SHA-256: 9537587aed8dbeac01ffd1e3209615d28abf5b32ff86ec54aee9c655f8b796a2