Malicious PDF — malware analysis report

Static analysis result for SHA-256 6575c89b73916a3a…

MALICIOUS

PDF

76.8 KB Created: 2021-03-21 12:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cebf414106b7ab82e1e6085ddc4f3ec6 SHA-1: f3dc6ebdc2dcfe59e5ded774714a73cda1ff761e SHA-256: 6575c89b73916a3ac4950fbc5ce25245c3ef3b6169554d5b23ed2c1eec858cc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://soxebez.ru/award?keyword=pectoral+muscles+anatomy+pdf PDF link annotation
    • http://mukovasisoro.mygamesonline.org/buscopan_bula.pdfIn PDF document text
    • http://normab-id.com/27285873196anghx.pdfIn PDF document text
    • http://dosijaruwiteli.mywebcommunity.org/wexowesomukitodanuxad.pdfIn PDF document text
    • http://kefinefure.iblogger.org/76725763054.pdfIn PDF document text
    • https://katodelof.weebly.com/uploads/1/3/6/0/136051175/sefuvepa_wolevi_rumape.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/app_state_campus_map.pdfIn PDF document text
    • https://zamigemunizi.weebly.com/uploads/1/3/4/3/134347724/kizefotagu_gaxobamag_jumibobiwonapu.pdfIn PDF document text
    • http://dolekil.22web.org/bladder_training_with_foley.pdfIn PDF document text
    • http://easycreditscore.info/1917313776973lgq.pdfIn PDF document text
    • http://nowtorrentz.com/firipuzopajuv2fji.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/gatasedo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutifesojare.epizy.com/calculate_deformation_from_strain.pdfIn PDF document text
    • http://roboketisi.rf.gd/nfl_playoffs_2020.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/unisa_second_semester_application_form_2020.pdfIn PDF document text
    • http://jonogib.epizy.com/wordpress_admin_panel_logo_change.pdfIn PDF document text
    • http://sumojoripira.rf.gd/sat_practice_test_with_answers_and_explanations.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_40b1ab4e73e747e5a317ec1885afe73e.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_f88f8241fbca4a66b18bc1d7748c6314.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_145798bfeb14422daf006207174808ba.pdf?index=trueIn 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_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 5404 bytes
SHA-256: b5e2a625d17d3fe2311eddef3d243992eac77e2b8a994b9dc794edcab6254435
font_01_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 10276 bytes
SHA-256: 5d43dd01f39b1395cde20a3ca9f321cf9feeabee7291248719c11ff50e86cbc7

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