Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e7fecb543c3366…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 10:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d8a21270a3ad6a16e93446e700d1210 SHA-1: 704a1e42d052088d8fdfcfef4abd2e88b73ad18e SHA-256: 22e7fecb543c33669d2e35bb2972dbfdde5e16a1378f3297b4f80f80da2f92f9
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. Heuristics indicate the PDF functions as a link farm, containing numerous links to disposable domains, with one specific URL identified as a potential entry point. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://infinijewelry.com/userfiles/file/kukurafuxufaxi.pdf In PDF document text
    • http://thepducphat.com/upload/files/dusaxupefowuxozade.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/67882959187.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/vakefujuno.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/2647325614.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/43ba7c596f7813aca2d556e4fa825df1/muvirivafosivedeser.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/lageravejolin.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/rivepaluruforemum.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/supulabibaremin.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/45060498276.pdfIn PDF document text
    • http://dasbluemchen.com/vodejedogevujikibaxodi.pdfIn PDF document text
    • http://p-energo.ru/content/file/pipepobunerufofozafiti.pdfIn PDF document text
    • https://businesslife.com/content/files/giziwegizototolin.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210908074945.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/litugiguloluban.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109022033251952.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/84123713473.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/28771047815.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/60616812790.pdfIn PDF document text
    • https://linker.tw/files/debofikipa.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/32852964902.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133255dbffe8---nigazu.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/muwosurugujuxuxepumikadod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=elemental+geosystems+pdfPDF 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_off0000cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 16956 bytes
SHA-256: a18835ef571aa2af8ecb0ab70c44b53f5c6b51359cd78f969fcee970191caf3d
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 10748 bytes
SHA-256: 13d7ae41f115ccd7c96548ac2b63a5adf5c32f8586af2aa340dfcf35a1e511c6

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