Malicious PDF — malware analysis report

Static analysis result for SHA-256 7778b3a729bebcba…

MALICIOUS

PDF

84.2 KB Created: 2021-03-25 20:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ebf90da080f0fe1d0de12b8b61d8d37 SHA-1: 540120a9b67488e3a42d19a9525f80cf170f20f0 SHA-256: 7778b3a729bebcbafb8353c85def39865bdd4d222e196be596c1be8ab9dac968
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs, with one prominent URL pointing to a suspicious domain. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/123?utm_term=barcelona+yesterday+match+highlights PDF link annotation
    • http://berasowugixo.mywebcommunity.org/58447785576.pdfIn PDF document text
    • http://item-get.top/xotapawefobuxazaliritukomme6v6.pdfIn PDF document text
    • http://zorovot.22web.org/14404306940.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/fovazujosomawilimilexod.pdfIn PDF document text
    • http://zespodsvetkoy.site/warm_bodies_hindi_dubbed_movie_free_downloadm31vv.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/giibjau/flippy_cube_dash_endless_jumper.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/ZojfjiW/sovuponiroserepujatanasos.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/minabotanenixuluwuroxemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_6e19720300ae492093660821c0d1686d.pdf?index=trueIn PDF document text
    • http://misugivunuzu.epizy.com/jumexusoxugazepaxo.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_08a0476b3a68499a926eec3156ee681a.pdf?index=trueIn PDF document text
    • http://kuxubakelixuzot.atwebpages.com/limofokotebaj.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/star_trek_enterprise_archer_and_tpol_fanfiction.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/what_are_the_different_styles_of_calligraphy.pdfIn PDF document text
    • http://sadozejeko.myartsonline.com/logo_quiz_world_answers_level_2.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_ae623daac11d4f63ae1ab60fe1be8ec1.pdf?index=trueIn PDF document text
    • http://netozovozuze.rf.gd/barfi_movie_free_in_hd_quality.pdfIn PDF document text
    • http://fumilojejukuro.rf.gd/kezudobixiseganigimuvuxup.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_cbbc48d1ac924ae2aed05c9409fbd38a.pdf?index=trueIn PDF document text
    • http://jaminuzifibe.onlinewebshop.net/46767915370.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 5504 bytes
SHA-256: f5051a42ba9287b2499a062e673b032891a5c7f4e1aed512aed8cbce73d107a6
font_01_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 10920 bytes
SHA-256: 8f64d71689bd5e44c1f596e0c7344a87ec99dd5a34e7164daa5b927ee191548f

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