Malicious PDF — malware analysis report

Static analysis result for SHA-256 6596e54d24ebc794…

MALICIOUS

PDF

73.4 KB Created: 2021-04-02 09:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72b22ff367496881294c86a813a47732 SHA-1: 5abb2b9c7304cb7109085e14857b8017a8c88e96 SHA-256: 6596e54d24ebc7943085b4581af95164f6a637d897bb3036964e8dbd82e9e641
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, with 'vilenefex.ru' and 'geforiro.scienceontheweb.net' being prominent examples. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and link farm suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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/wix?keyword=the+skin+i%2527m+in+discussion+guide+pdf
    • http://geforiro.scienceontheweb.net/56572962065.pdf
    • http://exampl1214.com/xujexozefesilegosatazideridnly.pdf
    • https://razavewi.weebly.com/uploads/1/3/0/8/130813306/9316347.pdf
    • http://jumpfs.space/mcgraw_hill_reading_wonders_5th_grade4tfi6.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/6114850.pdf
    • https://nazisedisan.weebly.com/uploads/1/3/1/8/131871674/wiwililonu-pumudes-pewedonufukid.pdf
    • http://kemytbok.xyz/35519925208f76ih.pdf
    • http://ptmonline.ru/tomegajarugaap8x5.pdf
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/243609.pdf
    • http://nowukusox.mypressonline.com/96299770102.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_61a50dacb0ac437891a70472067502f4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a1ba14a6-4b14-4893-ba1d-b2cb7cc679a7/wezekosumavibuzagat.pdf
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_605ca6def2844bdf9716b74cab694984.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a6bc50dd-833d-4aa1-b069-c0962954d2a3/whats_the_difference_between_spd_and_spd-sl.pdf
    • https://uploads.strikinglycdn.com/files/6ee037d5-6a82-4786-90d3-425c1244f75a/does_michael_die_in_the_godfather_3.pdf
    • https://uploads.strikinglycdn.com/files/9081d777-25cf-4b5b-84f4-0e8b0bdfd9ec/how_to_crochet_a_hooded_scarf_with_pockets.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_36ed7abd9ccb4f4f8414d61ac3908bd0.pdf?index=true
    • http://tosabukevosubar.myartsonline.com/c_d_waste_management_rules_2020.pdf
    • https://uploads.strikinglycdn.com/files/fd2184e3-dc14-444d-9a07-d01ffdb8041f/warehouse_safety_training_material.pdf
    • https://uploads.strikinglycdn.com/files/9b8b4695-7609-4c98-8ebc-781cab8a3d67/mulivoluzad.pdf
    • https://uploads.strikinglycdn.com/files/164bf715-73af-420c-bae8-c644212dff27/relapse_prevention_plan_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/4039c1f1-9455-4e61-bf4f-20d5a55b4965/33713391462.pdf
    • https://uploads.strikinglycdn.com/files/c0ddd650-e8b0-45e1-a69c-f3e949600f95/free_willy_cast_and_crew.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_off0000df97.bin
5ad10d88ea89b9bee989ff46bca4436505a8ffe2d8720b65c735311d23cbe2f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 5280 bytes
font_01_sfnt_off0000f179.bin
9ef31ba0c0a9f1508e73e8d156dc06293562c4e9c91b673b6fba62529340ba54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 11036 bytes

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