Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a2103f2415b8bf…

MALICIOUS

PDF

81.1 KB Created: 2021-04-05 21:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ffb0c6fdaf8a5023e013ed83663f941b SHA-1: 088c7a62f8c3f12b7aca124bbf077d175f1e3f5f SHA-256: b8a2103f2415b8bf16d484cde757b46dde4bda2bbe861eb672b45bc2923734ee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://kuzutuzo.ru/strik?utm_term=judith+butler+gender+trouble+preface+summary PDF link annotation
    • http://strahuemsya.info/what_is_indian_coast_guard_navik_gd71xzu.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/petebofuvotagikowup.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/city_fighter_vs_street_gang_apk_modz5d6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5fe49e0627cee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_60078db07d1f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_601e88b56e601.pdfIn PDF document text
    • http://kiwirixup.22web.org/senior_accountant_roles_and_responsibilities.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_5fd798936a1f4.pdfIn PDF document text
    • http://aydym.club/sugomozulumokugiwuxe1rktj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421788/normal_605f72c1c20b5.pdfIn PDF document text
    • http://ionatr.space/forgotten_realms_5th_edition_mapahytr.pdfIn PDF document text
    • http://barbanapoli.moscow/kokizokokaoqf.pdfIn PDF document text
    • http://euroshopmn.space/brother_hl-2270dw_user_guideh4ng9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5fe333dfe4f2f.pdfIn PDF document text
    • https://bexejasofipa.weebly.com/uploads/1/3/1/3/131397997/0f88ba81f36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_5fdc28f959c43.pdfIn PDF document text
    • http://zoneeuro.pro/how_do_i_save_garageband_as_mp3_on_iphonelpu3t.pdfIn PDF document text
    • https://muluxadi.weebly.com/uploads/1/3/1/4/131453645/3520489.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/9976766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ralabok.epizy.com/the_lightning_thief_movie_cast.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_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 5800 bytes
SHA-256: 7fe3c13821e2010b0254871a9e3d744abf39fcaa733383b5a51c4b1ce3fe44fb
font_01_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 10400 bytes
SHA-256: 42bfea65685e2401bcfeb31e0e7aab1d7d8009a3d4631d610212ea837dd24c09

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