Malicious PDF — malware analysis report

Static analysis result for SHA-256 50299c6c74e09fa5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 00:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce33cc8de199ccfebc878a7bd0e21a23 SHA-1: e6e51f16b90000119fafa07b23394ee5bc110c17 SHA-256: 50299c6c74e09fa5526b77d15fbfdf6e70c2501ae12cb1648dcbcf1aaf636422
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to potentially malicious or phishing sites. 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 0.9960

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 https://guruvinodji.com/Userfiles/file/siliso.pdf In PDF document text
    • http://www.zywawiara.pl/pliki/pikanozitapixis.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/24797944351.pdfIn PDF document text
    • http://irinabailey.com/upload/files/29389917293.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/zazatuzudelod.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/68229785658.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/21916528360.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d647754a7e0559c812ffbe2f473992eb/kokataxugusenogarovamaxim.pdfIn PDF document text
    • http://aven.su/userfiles/file/jixak.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c93c623f---pixabotaderedunaruvofeji.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/zuwufipesukow.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613d95ce9b7ba---31410645824.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/73238857850.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/81951711429.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210911001726.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210907184521.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/nozurekukofibex.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/55216534901.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/lesupodiwapoluzomuleg.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/woxagetunabiko.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/durelanatin.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/45935398196.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/garirorazagudutuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fake+credit+card+generator+for+verificationPDF 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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 10572 bytes
SHA-256: 19b852e69612326396fcc32934fb2da60a0d7fb23f5daec07e2650ad88bab0cc
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 18584 bytes
SHA-256: 5bdafe36925c5afcb7e1e00e07f82140d4289fb284aed6ab2b8931fc1d456802
font_02_sfnt_off0001242a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1