Malicious PDF — malware analysis report

Static analysis result for SHA-256 85349ce1300dd74b…

MALICIOUS

PDF

129.0 KB Created: 2021-03-28 17:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 75493b055237718c00160a8ad19136f2 SHA-1: 9d487dc0e3b8626ed6429cd7b806f2f496b47725 SHA-256: 85349ce1300dd74b61fbbf8e93ae523d07cfcb6106ad1ba25304f0c474deeaff
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=regle+jeu+de+carte+pour+2+joueurs PDF link annotation
    • http://siwupojotuj.getenjoyment.net/barcode_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefaxeker/hhcwQhe/56967061935.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/nafuloduk-xezal-nitujijajew.pdfIn PDF document text
    • https://rudesesima.weebly.com/uploads/1/3/3/9/133999787/1394412.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/hghfCjd/75242636388.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/lomizuneli.pdfIn PDF document text
    • http://nujusepu.iblogger.org/accounting_basics_for_dummies.pdfIn PDF document text
    • http://dazopumanufek.iblogger.org/rudram_lyrics_in_tamil_free_download.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/zewufasamidudi-torulir.pdfIn PDF document text
    • https://cdn.sqhk.co/xinefegepe/dYhcFhj/54319509337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wurebosuloxu.myartsonline.com/gepelavapiwisanuvepogakem.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/remipilimem.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_e6d293c8fb8c42ec86861cede208b984.pdf?index=trueIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_082a04361a954936a0131f054c205542.pdf?index=trueIn PDF document text
    • http://feniboladesa.rf.gd/ncert_11_biology_in_english.pdfIn PDF document text
    • http://jimarol.myartsonline.com/casio_solar_powered_watch_battery_replacement.pdfIn PDF document text
    • http://tonezifimoraga.epizy.com/tratamiento_nutricional_para_cancer_de_pulmon.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/blood_test_report_during_pregnancy.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_c31747e1e7ab4a16bf73c3c0235061ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pubopelej/tibelutoraforakodazof.pdfIn PDF document text
    • http://kakekixidowaj.rf.gd/nist_cybersecurity_framework_vs_iso_27001_mapping.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/bruegger_s_bagel_nutrition_information.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A28E 5456 bytes
SHA-256: 9a569244d89031fae88efb2eee8a61594938792a08434678e858fbbf327c8b93
font_01_sfnt_off0001b537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B537 13452 bytes
SHA-256: 073a36e5e78508afda8812c640d4cc6b6d6c67bf6c98a209b6a81acd3ae7285b
font_02_sfnt_off0001dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFA7 16080 bytes
SHA-256: bf2bb651642035a19e1b8bf5dc55c4db7948913289cd11d1f66f0c65c0fed8c7