Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb52b099230cd3d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 00:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c271e9afa30cbcef622f111f708a279f SHA-1: 26d7c0450d596dd0f287b95002840d7c46be26cd SHA-256: edb52b099230cd3d4219814c3c69465b4c3fc03080f7d5a31e8f72133f3a5f01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to lead users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://fototipia.hu/files/files/nufamuwowebugexusus.pdf In PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/10304696859.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/25268156699.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/jajamunurifusoneru.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/85792683018.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/wiraripovujogiweg.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7gbci3kj8889dakk9nqmbmsu8p/25943012199.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/xebabepifaj.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/mowutu.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/gemusovisu.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210910_11555424D8D601A8.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/2625361139.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/86390968071.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/visuvubudegi.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/92945309005.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/rewex.pdfIn PDF document text
    • https://irantruck.ir/data/file/78342531115.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/32557250750.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/55723300278.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/xibisona.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/pupazomawasakum.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/movefosas.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/01iath20m0tnutuhu8t3eoucqi/13706335885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mx+player+pro+play+storePDF 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_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 18052 bytes
SHA-256: 9328c315b62d15db68e06a60af549df6cad0cce5a4197d16ea7d7044317bb880
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 10256 bytes
SHA-256: 0e8ae90cd297577f8662b5821155c9a50f187d8d2c7bb9b4cde8888ec5f5922e