Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c26976cfbfd626a…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 19:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d160a62662701dd6376631c79e553ceb SHA-1: 0c446cd01dd3e46ded981fecf3e9b0cf9427df47 SHA-256: 0c26976cfbfd626a942b9440c6fd3aa962b3b762a1632e527889c13c523b676f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to distribute malware or conduct phishing by overwhelming the user with links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://inwebjor.ru/uplcv?utm_term=toy+code+generator PDF link annotation
    • https://greenways.at/userfiles/file/35674634501.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/tinetaguvawovuzo.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/juzapoduvasevefebeluduz.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/magotenukawefa.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/46785005281.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/070442532953.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/80470299351.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/gunob.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/17756727346.pdfIn PDF document text
    • http://soc-in.com/data/media/files/21853595814.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/najizovokebigozilibexuk.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/junizonimixip.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/26902608847.pdfIn PDF document text
    • http://santinitravel.co/files/others/basuzib.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/xijilu.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/sopurolidakonalulovos.pdfIn PDF document text
    • https://ikima.fr/uploads/file/tubigabaruwegunokid.pdfIn PDF document text
    • https://wecareprogram.org/images/file/tomabemokutalewira.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/35569506768.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b92d6aa1d3---joruzozuxonemezisugonev.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/luxapumurakuf.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/50974347526.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_off0000aca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA0 15312 bytes
SHA-256: aefdb6566494f009c3e5cb9f64fcb33e8ecce3440fa46c7613d1ab4f14d6cb94
font_01_sfnt_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 10316 bytes
SHA-256: e049b229f538eee9c192ec62d2aa770594e513f460128ee3563c58135510d832
font_02_sfnt_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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