Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4eea227d837dea…

MALICIOUS

PDF

73.2 KB Created: 2021-09-27 17:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 99ae07285e2137fdc5b8616ab53d89ec SHA-1: 083ee98d6db51e1aa5cee7d35808209d1b12e699 SHA-256: 4b4eea227d837dea33ade13fc2b78ef35ff942f99037ded55a67bc4a487ec65a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/worawedafitanemewor.pdf In PDF document text
    • http://fteq.ru/files/file/lifevazinalinivotades.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/tunazotab.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/45609443669.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/nuzivewelidigemi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1615054d2f1b7c---489852819.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/polaxovopeg.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/kepavufefijaje.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/xubuvitaratanisab.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6a6af4cd86f5d82d5960c920a498fc41/zodazivomuwese.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/54316882693.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/rezanabatenufevemifoze.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/tunazojon.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/mozowujozamakov.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/xopogifulafus.pdfIn PDF document text
    • http://skomi.ru/img/files/file/toxakanidoxawixogox.pdfIn PDF document text
    • http://marquisdecor.com/userfiles/file/xixikakuwidedavawudi.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/zagawezerogo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/52522211504.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/jetat.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/48043258875.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/muwijimurog.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/31210048907.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/waluvukasixubakajita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=adult+apk+for+firestickPDF 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_off0000b578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB578 10680 bytes
SHA-256: 0ca6c764a59ca76c86364ba544edf652acc942c58206b6483ee3736faebab15e
font_01_sfnt_off0000ce24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE24 18268 bytes
SHA-256: aa671643c6b0872a757dc0ed6c68c16c705cc2b4ade7ddc5e9e5a345dea92595
font_02_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1