Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8028aaf38e8a25…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 09:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 675dc334b3f7ebbf27d70b1767bbebb8 SHA-1: fa2b0b1567b53a7b9cbb66cf32b59270e4e2e4e3 SHA-256: 7a8028aaf38e8a25a82bf5e231b2b837ceb3aced0edbfa992a9539335156c642
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript. This JavaScript is likely responsible for redirecting users to external URLs, as suggested by the PDF_URI and EMBEDDED_URL findings. The presence of numerous external links, many pointing to PDF files on various domains, further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://onhimalayas.com/ckfinder/userfiles/files/76402830451.pdf In PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/xojiteponi.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210919230233.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/65237175582.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/mr4lberq3i652388ls8tfs2rti/pokuzitezumigivitejo.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/titamawusoz.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/nofimiz.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/sobabezegaxud.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/17755210864.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/relije.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/dodipexuzupexapod.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/94748406921.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/guvanepudoranotidediferem.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/dorotonatomofafibefe.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/wedige.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/riturajilanukumubijekaj.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/32173275103.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109030622187972.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/rugedawiwufi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17ea79d18---vogijadaxofitagapa.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/14287904935.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/23786668051.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/25184420001.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/xujikiwenewobibib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=top+17+movie+streaming+sitesPDF 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_off0000b279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 17108 bytes
SHA-256: 7846c372fb5db5f78734a72d94baff3d9ea2ae9e7e831277fe7831394ad61972
font_02_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 10680 bytes
SHA-256: ccb6f80712c84fe734626e6a3e284b6a05dde95652b23f3c0b7cb3e0683dd73a