Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f037b384949586…

MALICIOUS

PDF

71.4 KB Created: 2021-10-03 11:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b0af646ca5a5a5d681dabd3432acce7 SHA-1: bb2dd3f1ce6a8b3b7d84039947eb35d5eaa2aac6 SHA-256: c3f037b384949586e43c0d5df5bebba059ae40c1c70327e09d83604f1afba886
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs, suggesting it is designed to redirect users to potentially harmful websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=types+of+social+stratification+system PDF link annotation
    • https://afritransport.com/app/webroot/files/file/wirekalivuvunawokeloz.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/sotulik.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/63458752879.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/midasogiki.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/10024309245.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/nuribewofejir.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/7157c9323d10bcf2f5e34e8abc47e3e6/birekotik.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/rewawudimixejobapivo.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/94195013977.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/76454625007.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/46071517739.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021100311265467268.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/10587064406.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/33196506629.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/fabuziwojelug.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/39735199642.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/zozuzibaluz.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/58815102790.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/zubixerepepopilomefijelil.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/zedad.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/44214119339.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/76223952236.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/puvatemibolena.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_off0000b1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AE 10716 bytes
SHA-256: 2c11cd2022bdacc080ede7c6dd506cd5f9a45d894c4a14984155c2820c45ae4f
font_01_sfnt_off0000ca52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 17820 bytes
SHA-256: 2916d082bde22e1f07586ffdd8a0088e13bb24a491d690903fc22877502fc57a
font_02_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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