Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ece426d8872efd3…

MALICIOUS

PDF

90.4 KB Created: 2021-09-09 14:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 35eb40e86e8610d49340ed4589a96a16 SHA-1: d540f0869b57762083db54e1e7558f5abcfdf868 SHA-256: 3ece426d8872efd371da2e884d764b1f1c0a87c67642bea54c2c3a7fa5820dcc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests the PDF is designed to exploit vulnerabilities or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://indoshaolinkungfusociety.com/ckfinder/userfiles/files/78205655010.pdf In PDF document text
    • http://clerus.hu/files/file/rivenabinopejulewomob.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/bugumiliviwurovimopabexed.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/razawoxosuj.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/xisuwopuj.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613663eb21cd7---75366511758.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210906220739.pdfIn PDF document text
    • http://faradbox.pl/files/file/21766145266.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/32222086630.pdfIn PDF document text
    • http://timebymtm.com/upload/files/15398996777.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/74486222786.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/63489758258.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/5179619472.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/78233801892.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/34181715256.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/38802724183.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xodojoso.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/62765780612.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/35563315229.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/zevatexanasopaluki.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161361ded2a24c---71357451353.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/porimutitar.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/78565242442.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/gifizenizesuduxuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=expert+interviews+advantages+and+disadvantagesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 17756 bytes
SHA-256: 5b6c1e947ba1fa6fdba2edee1d4438dc30349450969ffc84e1533a96a7bdb002
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 17032 bytes
SHA-256: 4af516e21b006353a8a17b20c781c2685ae82638cd799386c48c8f843fb284e6
font_02_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000142c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C0 10640 bytes
SHA-256: 3fb3de37ee6b398c8e7e9368f4f821a8f0c59b2776ddf78fac53f24c9bdc9afe