Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2f3a679b25f966…

MALICIOUS

PDF

66.5 KB Created: 2021-06-03 19:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c101367f976d01e23cddb1e6cf521f53 SHA-1: 51fef6e80935205dc35739bd234a8ea88eef10dd SHA-256: fb2f3a679b25f9660dd7e888193bb1c2fc8b55d4b6bb7f6b9dce3e3ab40f59fa
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://druttle.ru/123?utm_term=voiced+and+voiceless+th+words+pdf PDF link annotation
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/2e8881d1ad0c.pdfIn PDF document text
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/2953263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_6064bf32b5e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_601592065b944.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412158/normal_60066632192bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489976/normal_5ff61ff4d16c3.pdfIn PDF document text
    • https://defoxili.weebly.com/uploads/1/3/4/5/134527702/d9aafb567431a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_604650e850326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_604369d412671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_6054dbe588dcf.pdfIn PDF document text
    • https://tubekari.weebly.com/uploads/1/3/1/6/131636965/pugugogun_dunipepimejewa_welen_vagenomilavitaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144490020/what_does_abnormal_test_result_mean.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144442377/81500644656.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144433173/descargar_guerra_mundial_z_espaol_latino_mega_1080p.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144560046/minatitesojorim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b46bef-b0e1-479d-89d1-b7486241b441/the_danger_of_a_single_story_ted_talk_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/099a1baa-ee12-451b-a28c-aa9175ee8c8b/can_you_sue_the_police_for_false_arrest_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/274e73b8-ab54-4de2-9738-d86a64f36e0a/dork_diaries_books_13-15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2791fac7-95d6-48f5-ada2-0365caaf1800/donigabeke.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144442260/class_4_maths_multiplication_and_division_worksheets.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144533901/unlimited_lp_and_money_sims_freeplay_ios.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_off0000c974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC974 5360 bytes
SHA-256: 0560bf8f8652dee97031663f91d48d14c0efc3d7e61695daf21a651477b0a4a3
font_01_sfnt_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 9184 bytes
SHA-256: 5470f2942d2e157535be55d8824e9ced46a96726e5ed823ece93a8cea27bad80

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