Malicious PDF — malware analysis report

Static analysis result for SHA-256 3602be6c6b99d316…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 19:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 90a6bbd845ec69028659eb19dcd7cc8f SHA-1: cc125a3c5911b199f0c146655e79a8bbdd17ade1 SHA-256: 3602be6c6b99d3165821cf81976d861c241cb17f811aa09fd4192c8a817a16ab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=matlab+basic+book+pdf PDF link annotation
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/28894066617.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/netekomotaseziwakorekoj.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/19232700637.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/xapexaxuso.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/pepakewi.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/1996256422.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/9685002351.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/33179803281.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/livoramewenufalo.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/fivesenupukepo.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210903195055383596.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/veregubamazam.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/fuvuroka.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bukifafuzugebel.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109021219219626.pdfIn PDF document text
    • http://sbkf.org/files/files/fefur.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/nuvexozupusevef.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/pigeradidudefuxuzajeworux.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/54482138981.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210903_B1610E4381D40CC8.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/sonofuxufemugimato.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/fatonip.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/lanutumojuxugaw.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_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 17308 bytes
SHA-256: c190dcf2a6425cff5c82c2d6c909f2888fbbdd8ae3d0a5e1da5ca825cf40cc34
font_01_sfnt_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 10500 bytes
SHA-256: 8c7dd5921c3d1e443be2bfa3c9a92959f4d68e05880cf6eab3995c2e6b52b8e9
font_02_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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