Malicious PDF — malware analysis report

Static analysis result for SHA-256 7960e3be735bbcee…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 21:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbf4daf9cb7731f77b2b403d64f8b32c SHA-1: be0da3d17409d189f6778ac315dab1c82d270470 SHA-256: 7960e3be735bbceefdf72f3d825dbcefaa568f5396d44ffa0d31b71555b73280
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. 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 0.9968

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://inwebjor.ru/uplcv?utm_term=stream+fight+club PDF link annotation
    • http://world-housing.jp/ckfinder/userfiles/files/joniperudam.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/65567041523.pdfIn PDF document text
    • http://npas.ru/pic/file/28056798212.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/98999795442.pdfIn PDF document text
    • http://mfcpavpos.ru/file/59073507457.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/99353417889.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210908140137-mazopuzukunowifazuri.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/xulofilipijowakid.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/kirizujaze.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/18664508949.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/44776601750.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/mupuxesagopefapego.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/wamelijunaboxi.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/89563980830.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/97606878463.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/1524932973.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/rivaxedolaxinoxebofowi.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/wabipor.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e7935c113c6c06b6845f4c8206ea68c6/86640829277.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/73110076435.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/60605710572.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/6038159594.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_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 19132 bytes
SHA-256: 94399bbd2db34afc47397e6401122f552f6fcaeff94d760658f7543bd6d4d844
font_01_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 10708 bytes
SHA-256: 570b0ed83375773f35f73f59382172d53489b4ef011cc627edeacaa30767a6a2
font_02_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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