Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe9bde461975067…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 02:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8559bedaf05ca403f49873293f8785e SHA-1: 8cd179d36f76f41fa1d44a38446667a8f74155bd SHA-256: 6fe9bde461975067d47e95688b5ff7883b883d2efc095b8532aa5fde4d4d7a5b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing trojan. It contains numerous external URLs, suggesting a link farm or redirection mechanism to malicious sites. Heuristics indicate the presence of urgency and download button lures, common in phishing campaigns to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=commando+3+full+movie+free+watch+online PDF link annotation
    • https://tauthuy.vn/upload/files/vopuzitududugiv.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/galapewiribibefesu.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/lazunuv.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/binolezubitegod.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/36813928946.pdfIn PDF document text
    • https://netlandschool.cl/files/jegopatadog.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/5111426626.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/12736225735.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-10/20210910183210336219.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/napirulig.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/pukuvunimanidetugiji.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/tabeta.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/tanitojojoxulebifejijaxex.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/posagakujebefigun.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/lulujiwukapoxuwikolumu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613840f5a54f9---22038232642.pdfIn PDF document text
    • https://slotpt2.com/contents/files/jusovu.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/26306175788.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/viwakef.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/60005891465.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/79703638001.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/16299343236.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/30145583842.pdfIn PDF document text
    • http://i-dron.cz/data/file/joripukubumet.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f9fa0a1ef4fc438435781bd070ed1b5b/nejoturidipuzugi.pdfIn PDF document text
    • 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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 19604 bytes
SHA-256: ed035bd19de11586c9b47247d9dce9474af07b60b6e23f0473b57206787476fc
font_02_sfnt_off000129c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 11028 bytes
SHA-256: 182dedfde68b6b2de7ccfbf522836d24ea674dda6b5c60492e33bb0a4daaae61