Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b58a51fd2776363…

MALICIOUS

PDF

70.6 KB Created: 2021-09-12 02:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b44fe3482ecab36fb0033f79d2a96620 SHA-1: 3a7aee8de6c0a257d4a544184b92c1e1cfbbb560 SHA-256: 8b58a51fd277636385140025b887207d07b6d042f9fdb61487778fbc7a3991e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many with 'utm_term' parameters, indicates a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://huntic.ru/uplcv?utm_term=best+free+games+in+ios PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7e204063---bigiwasamu.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/sekenigebitoxig.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tobesukawugemagatulalavi.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/dagazikukelozopuluj.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/wosirasurivokupubiju.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/mobusepedus.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/gufosejererome.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/16219339319.pdfIn PDF document text
    • http://napiarsaigh.com/images/suwizab.pdfIn PDF document text
    • https://theurbanthinktank.com/files/vuraburanidavutitilulewu.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/94463405550.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613263e7d9360---gujovirug.pdfIn PDF document text
    • https://medpressa.ru/files/file/xajigipixedid.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/17722014465.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/78114682101.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/felizixumixivolaxof.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202108312229266648.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/89037154526.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/60601368917.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/63829458642.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/mutewaxil.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/mikavonugux.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/jaxupusezenozimujumuvo.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/50943894176.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/natufevotumil.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/wafodutefofin.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_off0000b620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB620 15116 bytes
SHA-256: 189d37c655e4b3c6811514c6b09f5a8dc394b93393154dc31f33f437123ee8a4
font_01_sfnt_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 10564 bytes
SHA-256: edb6d9ecd24a5dcd27b6a80d22a3446f48407d6f69dc0a8c17df0f0240b6ef0d
font_02_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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