Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6766d6bd9be7e52…

MALICIOUS

PDF

72.2 KB Created: 2021-09-14 11:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3810ad5681310c4408fda5cee17c442a SHA-1: 0b1537212ff0525f41f93d608436c9e6094beb47 SHA-256: e6766d6bd9be7e52274a4ffdc32ab5f46099f583bb63fbbc849b478f56dd5464
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gilendor.cz/userfiles/file/26571113337.pdf In PDF document text
    • http://hladonural.ru/upload_picture/68120752159.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/vebozevifijoboxog.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xunowekizefose.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/22217909957.pdfIn PDF document text
    • https://pixel.bg/img/file/96514762982.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/86438487456.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/ledototubupolad.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/28967746325.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/89825136606.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/15959445999.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/22765472735.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/lafirorexopewa.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/jurasarusuto.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/64cdeeaa7e257f988bb82d286cfce6fd/46159883994.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/wegebogopojesef.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/24225435608.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/33713871677.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/zatisizewowejakajek.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/bazof.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/a7hhe69854pqa3ssceplbplhge/96125162451.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93290532645.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/xenitekizeti.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/gasemenigipexe.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/81892641349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gangstar+vegas+hack+mod+apkPDF 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_off0000ba39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 15380 bytes
SHA-256: da4fd0a3ebd1d14e7523154adb38ed11abd5b73e11d7684223961ddc3907cbfd
font_02_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 11020 bytes
SHA-256: d5e50f661c45eb68d1f9381b6062712e894e02fa2664a27212c5f6bdd38c35a2