Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09b8727d219fffd…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 17:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 367bd7485882af790acaf0aa9ab2589e SHA-1: 8aa17fe9cbb33adf250c2f3bccb9c67db5fde373 SHA-256: f09b8727d219fffd330eb6ad0958d989c56043d9a204689a109c4e0def3cf1d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is structured to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://irlanc.ru/uplcv?utm_term=gta+5+mod+download+for+android+free PDF link annotation
    • http://chuaphucluong.com/uploads/image/files/1968088827.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/40114460394.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/50561679760.pdfIn PDF document text
    • https://pratham.one/file/23848657169.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/31469878709.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/13301980737.pdfIn PDF document text
    • http://prmakeup.com/Image/files/36187520277.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/9132599976.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/vurivabirozerevifa.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/33317119353.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/zexanedupafezemefonowi.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bibipasowatika.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/fodaxevusuvisedefufowot.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/8097492733.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/25599927712.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/fupegupujoderusidipejes.pdfIn PDF document text
    • https://verner.lt/images/files/gavum.pdfIn PDF document text
    • http://pinxedien.net/upload/files/nezovatasezimu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161352dc2c201f---riwokuparijituxokalunus.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/kabafuv.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/70521097158.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/66961746164.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/jepukaka.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/kejar.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fjqlo8dae4ss8penkes9ekgl5v/wapanivuxikitagex.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_off0000b602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB602 10608 bytes
SHA-256: 72076db0ce32e3c692551828db60d43ab4742a774fa6b59b3fbf1ab0ccc19993
font_01_sfnt_off0000ce53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE53 17296 bytes
SHA-256: a4de15347d6afc37566d6e693bc757fd0b5e95e96926c163da9ce470fddf75da
font_02_sfnt_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1