Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca6a5d8c2f5a115…

MALICIOUS

PDF

78.9 KB Created: 2021-06-06 07:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d8e2e34664c63f03ea4b7594627be458 SHA-1: c3954108e9fa57108ad8295aac03cdc1b4aa9f3d SHA-256: dca6a5d8c2f5a115ab4ce87e6206cae2e293cbed852c4c1ff4dcf0f65df73cfe
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 embedded URLs, many pointing to link farms and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

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://ketchas.ru/pbw?utm_term=how+to+use+remote+for+spectrum+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373983/normal_60518ba1e4e21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415544/normal_6060d59a035c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475999/normal_601d672728936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366362/normal_5fc931bced406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_60506f91809a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5fd2875c8aafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/20a39426-e56d-4bd8-8409-3f33509c1766/49789355558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1290a2-3f7c-409b-bcd2-1d95187323a7/16562384098.pdfIn PDF document text
    • http://vamafob.pbworks.com/f/sentry_safe_wont_open_with_key_or_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288b913a-b69f-4f05-a957-8a7f8f667f75/el_nombre_del_viento_resumen_el_rincon_del_vago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0dbd1c-c93a-4718-b2cf-6a8e55038dbc/shakeology_chocolate_ingredients_list.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144477282/1174463482.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/what_is_kirkland_jelly_belly.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144665163/5709007103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311c9fd6-dcdb-49b9-8cec-50697cc1e5b9/how_to_become_a_data_migration_specialist.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144463191/2020_nec_code_book_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16dbfc62-3dc9-4d4c-91c8-160c92344d1f/44006539341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba16de10-b23f-41df-bada-bf9aad335312/what_describes_the_climate_of_an_area.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/57051225860.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/26071074048.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 4760 bytes
SHA-256: 88477a04cdd78ce4e325d452abeae2f71e98c1ffcafb18d53b0bb4ad823ab92a
font_01_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 10652 bytes
SHA-256: 56f050addfe2d3c54ae8d850b6b2595dd9694ff560050726d372b4ba915a3048
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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