Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde28faef49dd263…

MALICIOUS

PDF

75.6 KB Created: 2021-05-05 20:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a7a72db6a6bff21f8f646407e6d9faad SHA-1: d8b2bd883d2ffe453aad5648b5c16eb881c0b259 SHA-256: cde28faef49dd263f23d108ec72896c52101f6ec49444f8a72cbf7f380842724
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were extracted, the structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=middle+school+trivia+questions+and+answers+pdf PDF link annotation
    • http://xevojifixifepi.scienceontheweb.net/d_d_acquisitions_incorporated_download_free.pdfIn PDF document text
    • http://sarixibi.iblogger.org/belajar_kunci_gitar.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/70005409845.pdfIn PDF document text
    • http://sazinoz.mypressonline.com/amplificateur_oprationnel_exercice_corrig_mpsi.pdfIn PDF document text
    • http://lalikexitaxixix.getenjoyment.net/how_to_become_one_punch_man.pdfIn PDF document text
    • http://sobokapim.mypressonline.com/cambridge_igcse_economics_workbook_susan_grant.pdfIn PDF document text
    • http://zilitimo.getenjoyment.net/89666772733.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/brandt_commission_report.pdfIn PDF document text
    • http://kufigada.22web.org/rixunijigerilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizavinizekabos.rf.gd/3702965701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9c8625-f219-4577-a6a5-691c652b29e4/6.0_powerstroke_transmission_rebuild_kit.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/input_type_file_accept_and_doc.pdfIn PDF document text
    • http://zuruxiwowasigu.epizy.com/bermuda_triangle_in_urdu_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66554c94-b77a-42dd-971f-b74a0811fcd4/120_data_science_interview_questions_download.pdfIn PDF document text
    • http://jowokepo.atwebpages.com/suxaxopus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/680b2e8a-257d-400e-9049-a51906d503c6/imovie_para_iphone_7.pdfIn PDF document text
    • http://josotemasafu.rf.gd/food_label_math_worksheet_answers.pdfIn PDF document text
    • http://voginafukut.rf.gd/active_and_passive_voice_exercises_all_tenses.pdfIn PDF document text
    • http://vezapuro.rf.gd/47006433451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0878f7f-3cc6-4151-b4af-c29646f0a8e8/how_much_does_a_yamaha_r6_cost.pdfIn PDF document text
    • http://mewabetowa.myartsonline.com/90669230743.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_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 5528 bytes
SHA-256: 2a944c086fa581f7f29393dc7fa810c16c4cf7cc70fab8d234baaebdeb998c1c
font_01_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 11496 bytes
SHA-256: 93d8b7e7a0fb7f131897dd51a64965dd400792ea35c5d933117040ccb656eaeb

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