Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4dd8d8ebcdb367…

MALICIOUS

PDF

74.4 KB Created: 2021-09-22 09:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a653ee3f794fc45bef5e57d654bf826a SHA-1: 952c6e6d3e48ffe174df7a8df4a40e0fb013c9e2 SHA-256: 2c4dd8d8ebcdb36724c50a39aa5df33bd4f393e286ed595baa3c454a08449cf3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16149256cf36a0---riwadopaboz.pdf In PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/30909376169.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/tatujaxarore.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/pusopowexunigovalipoza.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1048362612614451e4e4939.pdfIn PDF document text
    • http://nktrading.qa/file/files/vifepeponamavubupupod.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/lorojujazubugawekenibe.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/31228046064.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/defitek.pdfIn PDF document text
    • http://villkasz.hu/editor_up/jitirosagurofebu.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/bivezutebano.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/59245983461.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/mudosakefitoxexopa.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/82740093776.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/5649639991.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/goxapagududadija.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/16488732975.pdfIn PDF document text
    • http://tfforming.ru/d/files/19285195922.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/movimejarenelikazapoj.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/47040020173.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/86214062358.pdfIn PDF document text
    • http://kme-kme.cz/files/file/69190500828.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/kodaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=juegos+rpg+en+espa%C3%B1ol+para+androidPDF 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_off0000bf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 10768 bytes
SHA-256: a222ea5c99a4ad292a542b0563969c1cf97ae35649a88ebac444264ed6282498
font_02_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 17176 bytes
SHA-256: c16f7a2c0ff45f9baa028b32e4bdcd1fe9aac5c00e36059830b07ded7de9f496