Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bcc724f8e7350d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-25 13:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4524640f48d12eda4819778258d606be SHA-1: 63ff46b72bd5ce2b9bd9b4fb5e852ff73e1a871f SHA-256: 83bcc724f8e7350d7b0c5ff6059871cc1077499fb4f80296f46ec5b178a7afa6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting and are used in link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=block+mobile+data+android PDF link annotation
    • http://perksys.com/userfiles/file/ruxokotizemezavajo.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/jojuduzu.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikidajasemezoras.pdfIn PDF document text
    • http://holzbau-napetschnig.at/xoduwake.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/vulupowefazuno.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/39057411787.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/fisuzazalogafu.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/18230557676.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/solanitomasajesi.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/56188336787.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/dorexepejizazu.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/33241428032.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/87966616235.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/molupawitesuwifiva.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/kejebexawozelaxa.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/49196697845.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/89812467355.pdfIn PDF document text
    • https://razredna-nastava.net/files/19635953233.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/sinupiwu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16141aab477771---zekuwixufidabuj.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vijak.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/15111669900.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/13474245157.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/88989167688.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_off0000bc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4F 19232 bytes
SHA-256: f7433a09c46f557c3779ede462758114bdf0afcd1e7d76bf1e32671a536b342b
font_01_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 10648 bytes
SHA-256: 433d0e44863e9bdb6434e8919c16eda4868e64fef40c27c66ac369cc205c6a46

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