Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4e7ba623a95b69…

MALICIOUS

PDF

75.9 KB Created: 2021-03-28 10:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 35a5f80b52a465c58fb8900639aea827 SHA-1: 8eac9f4fbe10892fb2226b6c6f56f3143bb1bd69 SHA-256: cb4e7ba623a95b6901d869055cbb4bc5e51450d7abb6de32fccefb6a69029e89
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm on disposable hosting, with numerous external URIs, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=decolonizing+the+mind+analysis+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcb36f05207b.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/jgheKAn/niwigugixav.pdfIn PDF document text
    • https://cdn.sqhk.co/rexazileka/gE6QOpJ/fogataruxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_5fe84f689a6f6.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/banepato4bdr5.pdfIn PDF document text
    • http://brumbum3.xyz/trio_chapahalls_vol_2sbzfo.pdfIn PDF document text
    • http://ru-dev.xyz/cuantas_clases_de_sistemas_operativos_hayyd9tj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5ff8a1671082b.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/khbgihe/lemirifaxesarafuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/4TaDhev/south_american_football_club_logos.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/hdhijii/10626920357.pdfIn PDF document text
    • http://vvd.bar/autodesk_revit_mep_tutorialpjhf7.pdfIn PDF document text
    • http://teenagetutor.online/xaxumufubwew38.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/welumamilivedamounaqq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5fd201521eae4.pdfIn PDF document text
    • http://reetodo.online/how_to_clear_ve_check_engine_light7y1ev.pdfIn PDF document text
    • http://gprofights.ru/bixilugofiduoyuum.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/2bd0f830-c8f3-47b5-a94b-bbf8dcece7d7/what_to_eat_shredded_bbq_chicken_with.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/application_letter_for_college_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/apa_format_cover_page_purdue_owl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155c8233-aa80-448a-bd28-8e0d962e5328/neil_gaiman_quotes_about_libraries.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/4623888960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dcd16ee-49fb-4ac9-b32b-41020567ee3d/94676547739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8391289-1d8c-4e8c-ab05-a7d5e6c03e23/ikea_catalogue_2019.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_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 5624 bytes
SHA-256: 20b6e6691042c1052621c0467f99c38cbaa99921db8310d2b7b565328c139540
font_01_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 10812 bytes
SHA-256: 0cbdb87ecea6b2a25406ca67a30e14e785da3b481c7764c84ce9cedb9235d2fd

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