Malicious PDF — malware analysis report

Static analysis result for SHA-256 8701b9f3eba48ef4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-22 10:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eda78a50aad97a8f1747feb7166bae18 SHA-1: ae7072421dae40dc50a692591ab5b520a78d6c8e SHA-256: 8701b9f3eba48ef4f506309e5ef37c6689b6173357a35f1c46851ba06a3c32ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, likely for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://lynhuagiasi.com/Images_upload/files/83652355830.pdf In PDF document text
    • http://youil.org/userData/board/file/25431354460.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/62830845047.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/18157548934.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/puzaxepavewuzojajezu.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/30625933297.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/mumitikefupiridetuz.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907221514.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/25036804167.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ih613pmd0sg1a6ajeaj70mtob2/21576842187.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/dawizipumogola.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///jesuneboboganafatijima.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210910_142250.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/32540385406.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161351d87e5507---mifadadupobavonemaxexonox.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/14119128506.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/fifij.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/suninofobakefupitamupu.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/50947483250.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/wezusijurikifewutafep.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/rubusomokapudij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gta+4+game+android+downloadPDF 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_off0000b185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB185 18932 bytes
SHA-256: a09bac273a5f0a45d7014265fe4be9b9457bc168d13cfa0e1aec2e0fb8013b76
font_01_sfnt_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 10628 bytes
SHA-256: 8086ec78f778a79e1dae7188fa1f5b5ea0f529905e7f4169d177b558a011c285
font_02_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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