Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ba0f776a6df336…

MALICIOUS

PDF

105.0 KB Created: 2021-04-05 14:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 025008cf445ed190437c28d36e440b73 SHA-1: ccd36505d82daa43fdae42c8d3e59feb5ace2fd3 SHA-256: 26ba0f776a6df33627310d338bfbcf3300fe44ef74b3fc7dcd3408e3bb17884e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/award?keyword=tipos+de+asfixia+mecanica+pdf PDF link annotation
    • https://cdn.sqhk.co/vizelupavew/e3hghbe/sulovitajewusuvotafonud.pdfIn PDF document text
    • http://geosen.net/free_templates_for_blogger_2018ok299.pdfIn PDF document text
    • http://fokefetebebinin.66ghz.com/kathmandu_plane_crash_report.pdfIn PDF document text
    • http://herss.space/hell_divers_book_wikiwx5t3.pdfIn PDF document text
    • https://cdn.sqhk.co/dazulegug/aifiac0/fps_strike_3d_free_online_shooting_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/jefulajidi/aS5jehe/lucky_block_minecraft_map.pdfIn PDF document text
    • https://cdn.sqhk.co/muwanije/hcJ99ib/vadefufadarezaxefujipe.pdfIn PDF document text
    • https://xikunamoveg.weebly.com/uploads/1/3/4/5/134596382/dodugurix.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/mastering_full_stack_react_web_development_downloadrw998.pdfIn PDF document text
    • http://fabulouss.space/borderline2C_narcissistic2C_and_schizoid_adaptationsdrs4k.pdfIn PDF document text
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/lanabuziduteru.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/gZicRAG/79095455490.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisaxabajerofu.epizy.com/welobuvitulovube.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/jijadetimebulatubawe.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/arkansas_drivers_permit_regulations.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/nosobuwapabivejatubemirut.pdfIn PDF document text
    • http://gedesopow.rf.gd/barsega_sawan_free.pdfIn PDF document text
    • http://pezatiwasab.epizy.com/importance_of_leadership_in_community_development.pdfIn PDF document text
    • http://tuzikarowom.epizy.com/bikelu.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_off00015cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB1 5192 bytes
SHA-256: 29d8ea22214928e699cd7bad1c13d2ff0c2474489b847b66581ede7e820e5c4e
font_01_sfnt_off00016e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E58 12184 bytes
SHA-256: ca01e0ea90b835193ebf626a5fb969fa93632d3510162a93aaf08c001f0b7e88

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