Malicious PDF — malware analysis report

Static analysis result for SHA-256 5636be4b446a8b18…

MALICIOUS

PDF

92.3 KB Created: 2021-09-08 17:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9068ee6b96bd74ffccece0b9b6a34898 SHA-1: 0a1d2376d9878013ffacc74b65660932cca70e85 SHA-256: 5636be4b446a8b1823f2ccdc4dbf4dfb4f92eb10ea55dceace3289ba21fe36f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, many of which point to disposable hosting, suggesting a link farm or phishing attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/rofuximaxutamonif.pdf In PDF document text
    • https://renteci.com/imagens/file/78701468379.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/legodilawarunutofijeze.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/wejapofiniwapagono.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/4776934671.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109030352381227.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/fobero.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/diludamemuruvafevevi.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/rotorovizezawetevud.pdfIn PDF document text
    • https://stvorki.ru/files/file/89559365738.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/vixumujegogadi.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/lesimile.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/korixometerofezipenuroz.pdfIn PDF document text
    • http://bomando.bomsolar.com/uploadfiles/files/86524628241.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/9879251141.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/kowozuwosonunadexiwido.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5b944a0a---bezozu.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/47135893704.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/matutiwawagamaxukaka.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/davitotebugiwenogaketa.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/xalumasitowa.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/81455420323.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa9a6e6e1---mexix.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/13720122814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pastor+appreciation+program+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_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 10916 bytes
SHA-256: e3a291960f179c6fa392e654d911689b1fb19d3656831a11eb1f304f4c610bbb
font_02_sfnt_off00013222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 19296 bytes
SHA-256: 62e428d400418c20745dc02add64d24a8382d628d0bf0cbcc6bcf9dd9bd9c466