Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1563a7c866a788…

MALICIOUS

PDF

75.3 KB Created: 2021-06-01 05:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c7314e3c365c775a54d322808ecabf89 SHA-1: 2b884e54c589f7b44160bd1b2b6ff72e625742d3 SHA-256: 4f1563a7c866a788cff7b1c26dc2f79637a3db84c0ba484cfde1bc54c50157fe
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=leon+gordis+epidemiologia+pdf+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469105/normal_5ff64edf25330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375708/normal_6003b69c9d322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_5fe6a72b868d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5fcb2b3ca804b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_603c6eddb6c38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_6017b214243a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479688/normal_5fed2bf8f4070.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fee0fd5-5cfc-4e3d-835d-f06951bde0b7/code_name_verity_chapter_2_summary.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144426018/58688280365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9f7d85-6577-4188-8f16-7f675f1047a2/i_hate_to_see_the_evening_sun_go_down_beatles.pdfIn PDF document text
    • http://bepisoxu.pbworks.com/w/file/fetch/144435729/rojapumejebikifob.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/w/file/fetch/144413796/80242083762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd245c7-a7b3-4692-b345-efdb3487f620/tojulufavivuselirozo.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/w/file/fetch/144435108/asme_y14_5m_2009_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/821aa8b5-bcf7-4714-b066-931d6db4f85c/what_is_my_verizon_hotspot_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5b9692-6ff4-4380-929f-f9f320155796/my_favourite_food_paragraph_for_class_three.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144417621/35744103273.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/f/12633034179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9314abd-0ace-4857-a8bc-8cf530f59456/49046199433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/895f04bb-d98b-4b8e-b303-48f189c03f64/63235883407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad7af16-96b9-4c63-9204-c59a77e36150/voxunoza.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_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 5300 bytes
SHA-256: 639716f8dcb1433a9390346761f56fff16e01bfb18ceab1c43eefc5387cdef47
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 11776 bytes
SHA-256: 336aa741eba2918c154a70909d85ac66ba9a752322fc12082a4f24308e464881

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