Malicious PDF — malware analysis report

Static analysis result for SHA-256 179ecbaa8d51e552…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 06:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d5dc6ccb5e6af17526de902012311ad SHA-1: ca5206182c585c2f2c3ebf68c525d748d80931d2 SHA-256: 179ecbaa8d51e55254ac362be2fbbff29f5f88be2bcb3dfb9461d8468f00cd63
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the PDF suggests it's being delivered as a malicious attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=blood+and+chocolate+pdf PDF link annotation
    • http://buyyoutubesubscribers.com/ci/userfiles/files/zixono.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/lugepofenetagijewowemana.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/75670523200.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/30567353994.pdfIn PDF document text
    • https://doitoutdoorz.com/file/FtUjs7SbTRnSIfK4.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/98178790209.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/47569212156.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/16566225032.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/bizotapidatogifulan.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/bemuna.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/mirukisebexubut.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/zutuboj.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/xizetujemomebukuporog.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/marobabowufozagupez.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/maxowelebenubobi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94b6e93ec---vofirikapidizas.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/16600021419.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/mepenezes.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/tajodaxovupogobegizisatad.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f331ede475---konatuterogowukasuxusof.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/kosorovobexuxaraxewi.pdfIn PDF document text
    • http://plncse.hu/php_data/file/miwolizofexopaxibilixav.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/zaduvugonarowavizasazidej.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_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 18316 bytes
SHA-256: 40df2ad1b7b9582fa1a01a565525147f015a12275af9b62bdf6a42df90404b40
font_01_sfnt_off00011364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 10412 bytes
SHA-256: 7cb29aec245d63eab63548e28f7a6f8aa7d5478e2c4afd3bf9d36cd6ff171be3
font_02_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1