Malicious PDF — malware analysis report

Static analysis result for SHA-256 4271c5a5cf61ae50…

MALICIOUS

PDF

79.1 KB Created: 2021-09-14 02:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89b35719437313ef462b33dac90b649a SHA-1: 6d5878da83d9829594c2946ee0f616ea81dafee1 SHA-256: 4271c5a5cf61ae50d7ee8acb5fd7e5ab8eae75b4d743a44192eea251f86faf7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple distinct hosts. The presence of numerous embedded URLs, many pointing to potentially disposable domains, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nagyberki.hu/sites/default/files/fck_uploads/file/87060437379.pdf In PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dunukubi.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86250498223.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/jebadufavarodus.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/mezegemagutifibekazap.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/karubademanimalepulupuxan.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed94486db6---64346986856.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/rofufukagofak.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/23533408087.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/jibodirutedofalezekizo.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/ragejoregolapisaga.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/79601764726.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/tifez.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/xawamiwudujiz.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/wejibuzerogogogalup.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/75501737037.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/pokis.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/wukituk.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a058dad38---gizexenujopane.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/pasulisunidetupiwab.pdfIn PDF document text
    • https://tepihtrava.rs/files/94055175123.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/totoragatuwuselekasemo.pdfIn PDF document text
    • http://csp.hu/editor_up/88351178770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=queen+full+movie+onlinePDF 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_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 17188 bytes
SHA-256: 3fbe4690e0590321880f10f540b3cabc10ded48efabfda9376ea229f722611f4
font_02_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 10072 bytes
SHA-256: e687ccd0f63facf8bdfcb32cb76d523f2240c2613c05dc92710fb36ed5063b03

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