Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e36e84ea443b027…

MALICIOUS

PDF

76.1 KB Created: 2021-03-18 09:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b38a64f6f0cd7508e7488de1fa51f95a SHA-1: 51a92300f3070f23e03e60f17db61470bd06b443 SHA-256: 7e36e84ea443b027ed8b0d2cd53baaf66b605dcf3f2700e8ff696fe78928126b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/strik?utm_term=how+to+make+creamy+cajun+chicken+pasta PDF link annotation
    • http://gadomiru.22web.org/potabore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476147/normal_600f9b00c472e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473903/normal_5fe64e305c66a.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/17850211193.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/casio_f91w-1_strap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491175/normal_5fe6324e2e922.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/the_birchbark_house_journeys_comprehension_questions.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/mulalugukobiranirurugagem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446497/normal_60006a6677a56.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/how_do_i_recover_my_facebook_password_without_email_and_phone_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_79195aee184b4a919d3281de7beac865.pdf?index=trueIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_6ecc8c9ab49a48fdae3bb7edb46a750d.pdf?index=trueIn PDF document text
    • https://8dea6f00-b35b-4e5f-9f5e-01d9eb130a9a.filesusr.com/ugd/6a8da5_b9b93c430aed4c43b012f3f89e82dde5.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_5709f160640c4357b4b5f2c3f69ea669.pdf?index=trueIn PDF document text
    • http://vedixemalirugi.atwebpages.com/haier_mini_fridge_thermostat_replacement.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_1623aaeb52274ff6b98255aed04ee350.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_00e7680bd07c4cdc98b6713ea6f280e9.pdf?index=trueIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_9e3f52a72d324b5792fc08a0b286a9fa.pdf?index=trueIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_12046efd61ba42a9864b4a8b77d21bf4.pdf?index=trueIn PDF document text
    • http://nibubatovavav.atwebpages.com/alvaro_gonzalez_alorda.pdfIn PDF document text
    • http://wenares.myartsonline.com/31799181974.pdfIn PDF document text
    • http://keximatefabuzi.rf.gd/asean_charter_bahasa_indonesia.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_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 5436 bytes
SHA-256: b34d921c8e459be272e85680ec36ec668e3c1d1788fe1a6cd245df4f09a4c22a
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 10564 bytes
SHA-256: 9cdbaa1025c5ec1518edad25214e51b54a203b8475a229138542a613282f757a