Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e60dbfe8b3bb40…

MALICIOUS

PDF

85.8 KB Created: 2021-09-10 10:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f703aaadbc5165e7460d7b8f158e4d9b SHA-1: 6d2cb5339f93b89ba617b11154ef33e3fb328037 SHA-256: c9e60dbfe8b3bb40d2d77e014f57b87d37e7c132d5ce12f661c3e1e996214298
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The presence of JavaScript and numerous links suggests the document is intended to redirect users to malicious sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=odyssey+graphic+novel+pdf PDF link annotation
    • https://jdrum-music.com/uploads/ckfiles/files/23110764097.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/54302985295.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/sowozugilomupupa.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/linidepimukijuvarawam.pdfIn PDF document text
    • https://ratosatu.com/contents/files/440837256.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/bulufoxetavevutaxolun.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/29536117153.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/1074843012.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/62342429109.pdfIn PDF document text
    • http://unibox.lv/files/text/94105898748.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/78925266435.pdfIn PDF document text
    • https://egca.fr/userfiles/file/2161329251.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/lutekobovedekavimivodapog.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/xupuzujadijirir.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/49893141222.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/botigapojola.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa97c861c9---sosefamobowutenujutikevox.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/pofafexexejobuxo.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/rigenesedupe.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/88751594023.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/18797129758.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_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 18576 bytes
SHA-256: baf85c3a37f32bdb99d540dd1a0821dcb75ad76357da00984b6170f2e567d387
font_01_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 11004 bytes
SHA-256: 0dc8653b9191ea70e57c18c9e1094d8d7671156853aba5b2fff9106d91fa3dff

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