Malicious PDF — malware analysis report

Static analysis result for SHA-256 5120bc164edff52a…

MALICIOUS

PDF

77.8 KB Created: 2021-03-22 07:29:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05b59cb09ac3b967871edbc497ce28a4 SHA-1: 568c6e3135e851e0eeb5490847b04c934264ee4a SHA-256: 5120bc164edff52ae47c5fb3682bd8de4431394349c07502646228db26b1e412
126 Risk Score

Malware Insights

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

The file is a PDF with numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/award?keyword=evernote+pdf+markup PDF link annotation
    • http://bella24.xyz/how_to_use_charter_remote_for_tv2uowp.pdfIn PDF document text
    • http://probnik1313.tech/flying_monkey_jeans_wholesale2601x.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/sitamipube.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/jejcjiI/duboxomowubapelu.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/how_to_make_a_book_out_of_paper_step_by_stepe9g1b.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/cKjxc2S/mewolusuwobazinuropugozaj.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/samsung_model_rf267abrs_ice_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/ogh4UIm/general_hospital_spoilers_next_week.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/188fbdc00ed.pdfIn PDF document text
    • https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/2766521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413013/normal_6003bdf7c3a72.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/dupeg.pdfIn PDF document text
    • http://shothard.site/accrued_expenses_balance_sheet_deutsch1zeei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481161/normal_60579ee69ff7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd661013c96a.pdfIn PDF document text
    • https://nejituxunexako.weebly.com/uploads/1/3/2/7/132712325/2261747.pdfIn PDF document text
    • http://fifamarketbot.com/ahlam_mosteghanemi_nissianrj4zr.pdfIn PDF document text
    • https://tejojixamabaje.weebly.com/uploads/1/3/2/7/132740549/neguxanokifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/que_clases_de_grupos_etnicos_existen.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/kajininep.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/nestle_malaysia_company_profile.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/eu_country_report_albania_2018.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_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 5060 bytes
SHA-256: 78cfd0b2eba378e294028fdf3404666134ba691e741acb4d9dce89bf629354ba
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 12160 bytes
SHA-256: b2b383d0604b883b83ad2f69853942c5a2725b5527e6464c0fbddecab0fd3398

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