Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd1b22aaf17384d…

MALICIOUS

PDF

82.2 KB Created: 2021-03-24 18:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f1758e9e2eafa512df3456529529101e SHA-1: 59cf9979ee006b34703a30d57c4b3d2318f83b6e SHA-256: cbd1b22aaf17384d60cf01aaad181209d91a4e7547c9c88618ad3b042b8ef065
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a lure for users seeking specific information, likely to distribute malware or phish for credentials. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://ponafet.ru/123?utm_term=format+javascript+sublime+text+3 PDF link annotation
    • http://fapasevusiledap.mygamesonline.org/70-410_installing_and_configuring_windows_server_2012.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/gejiijb/free_printable_coloring_pages_for_adults_only_quotes.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/world_war_1_test_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/cUgiWWV/my_dream_hospital_doctor_family_er_emergency_simulator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381735/normal_6054e9dfeb7bf.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/kifarolita.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/agrotis_ipsilon_ciclo_de_vida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_6041c209e47a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_603308c5eb39d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jurizamumi.myartsonline.com/flat_belly_diet_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443d1283-ec0d-4c46-bfde-93e9e5fda284/enoch_powell_rivers_of_blood_full.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_48b5dd5d02ac48058fb390a8810a9714.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_0d3e9fb46fe949128a4f33253239a4a7.pdf?index=trueIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/ronisivuronuforikol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8ee358-c8ad-40ed-b718-14f01b56daba/charles_bukowski_best_poetry_books.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_6a12c5bcf6074a7284679d4b7ef23209.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d81b32-d9ce-4da3-b622-d7459591fb11/fitted_face_mask_patterns_free.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/apprenticed_to_a_himalayan_master_free.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_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 5544 bytes
SHA-256: 0fc3761edabfd8643397b662803b8042b72fcf79f683a67dbe47693a7b7eca1c
font_01_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 12184 bytes
SHA-256: 574db5a5649e015ed9a8d3cc47c1ac9079fa18694063ad7d8973b77a4ba3a38d

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