Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5a9333636a4094…

MALICIOUS

PDF

84.9 KB Created: 2021-06-06 14:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fac5013a0545ebf0940ad3cf094d15c SHA-1: ea226aaed2c48840f3a455a725aa512f58981491 SHA-256: 9a5a9333636a409472bebbc3d6ea6f2ea02b171286ba5e6b8ab8cce4edf09246
164 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and a call-to-action button, suggesting a phishing or scam attempt. The presence of an embedded URL pointing to 'vilenefex.ru' further supports this, as it is likely a malicious domain used for distributing further payloads or phishing content. The ClamAV detection and ML classifier output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/123?utm_term=udemy+video+er+plugin
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/c83bbf05d.pdf
    • https://vewagabijepafin.weebly.com/uploads/1/3/5/3/135348553/mafomaxazo_powudeje_sebegatuxokok.pdf
    • https://xegavepixax.weebly.com/uploads/1/3/1/4/131452872/81e8833d06ecad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0669775a-368d-4852-b7a1-e632d15f6ba5/they_say_i_say_4th_edition_free_online.pdf
    • http://liguduper.pbworks.com/f/vrat_katha_in_hindi_download.pdf
    • http://litorabi.pbworks.com/f/tum_bin_2_full_movie_hd_1080p_free_download.pdf
    • https://uploads.strikinglycdn.com/files/1bcc55f9-a0ed-4adc-9ac1-9992c368303c/84922877296.pdf
    • https://uploads.strikinglycdn.com/files/d553d3f3-278e-4a30-962d-588b1d78aa9b/what_is_the_synonym_of_sense_of_responsibility.pdf
    • http://genarozep.pbworks.com/w/file/fetch/144521403/46468647997.pdf
    • https://uploads.strikinglycdn.com/files/f6da713a-8d3b-4e98-99f1-2d0b09246857/55007448017.pdf
    • https://uploads.strikinglycdn.com/files/a51540a6-30d2-4301-b424-0a0aff753152/perugakuboneterorij.pdf
    • http://dagomiwavi.pbworks.com/f/coreldraw_x6_free_download_full_version_with_crack_for_mac.pdf
    • https://uploads.strikinglycdn.com/files/64451f36-6f5a-4b2f-a86f-dd426b8d9b85/how_to_draw_3d_letters_step_by_step_easy.pdf
    • https://uploads.strikinglycdn.com/files/5a0205bb-f3b3-43c7-8b4d-cb626ac61ed2/22977839720.pdf
    • https://uploads.strikinglycdn.com/files/e50fb631-e3c8-4fcc-8361-4dc34ec4df38/how_long_do_timex_watch_batteries_last.pdf
    • https://uploads.strikinglycdn.com/files/b57abb7c-8d68-4533-bcc5-119917de4af9/dell_s2415h_manual.pdf
    • http://fesatisobif.pbworks.com/w/file/fetch/144715317/how_to_tell_if_you_have_piriformis_syndrome.pdf
    • https://uploads.strikinglycdn.com/files/81913071-ac6e-47fe-a23d-579addba4bec/5614078136.pdf
    • https://uploads.strikinglycdn.com/files/37efe239-8994-4828-8c7c-ab6af034a841/what_is_coa_in_army.pdf
    • https://uploads.strikinglycdn.com/files/ebb4f458-66da-4b54-a27c-8aedd020e1e9/can_market_crash_in_2021.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144418959/poliboloduwewonarodunozon.pdf
    • https://uploads.strikinglycdn.com/files/c05f5286-db53-4cb0-b45b-3f8637b8b3c0/plato_republic_book_10.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c05.bin
3f61aaf57c6ddf61a79516344fd6a3efc80bf9efcfbddb0cdf00b86887f49afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 5044 bytes
font_01_sfnt_off00011d2a.bin
10ffe5b6833765196a9673adc30286f4266b0374293feff3d6e46ba50a0d79bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2A 12156 bytes

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