Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b1beee91a8350f…

MALICIOUS

PDF

76.6 KB Created: 2021-03-04 01:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 94c24ec2760208632c15369a9278e957 SHA-1: 08d09b2c6f6ec0ca8c040baa0bf2b370911e0efb SHA-256: f4b1beee91a8350fb0b7075b7ae4899553d0a4ff16239a8308a3ce499faab9da
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, including one that mimics a search result for "what are the 5 elements of short story" on the domain jacksth.ru. The PDF also functions as a link farm, directing users to various other PDF files hosted on disposable domains, suggesting a phishing or malware distribution scheme.

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://jacksth.ru/award?keyword=what+are+the+5+elements+of+short+story PDF link annotation
    • http://muzhskoizhurnal.ru/logubafeuujhc.pdfIn PDF document text
    • http://xovekofetovo.66ghz.com/braven_stryde_360_user_guide.pdfIn PDF document text
    • http://bufenukaje.22web.org/kupodonujebujizoma.pdfIn PDF document text
    • http://bemelegevew.22web.org/fijinufesusanitam.pdfIn PDF document text
    • http://wavepolabipal.22web.org/lododaredokekifajet.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/how_to_troubleshoot_maytag_ice_maker.pdfIn PDF document text
    • http://jodujimapiwox.22web.org/british_council_teaching_english_worksheets.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/36954461996.pdfIn PDF document text
    • http://pikejofopon.mypressonline.com/imax_b6ac_80w_6a_updated_balance_charger.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipanokule.onlinewebshop.net/69036346132.pdfIn PDF document text
    • http://xuramilipadig.rf.gd/dotizuwatoza.pdfIn PDF document text
    • http://rabuxudizuxu.epizy.com/16186711085.pdfIn PDF document text
    • http://wazozugafen.epizy.com/discounted_cash_flow_excel_template_free.pdfIn PDF document text
    • http://pofegafiwej.epizy.com/klavier_rammstein_sheet_music.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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 5244 bytes
SHA-256: 2411de5d17aa851fbbf6f0331404f3878e07963e7261f6f875f7d4f8f5b77523
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 10148 bytes
SHA-256: 3fb6d7b965aac5659a1844eed8f88ece793bbe6e08aca2e362bda333fd29ea65