Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e24ff89779e2151…

MALICIOUS

PDF

71.8 KB Created: 2021-02-23 01:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2fe9639250845efbcd5d823346064844 SHA-1: 47f57748334ea8c6f0aa314e93e5230283bb9d0d SHA-256: 0e24ff89779e215149987eec64e2ce5820b1d9183aebdc1639fd8714fb469736
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('jacksth.ru') that is likely used to host a phishing page or distribute further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to redirect users to multiple external sites, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=what+are+the+stages+of+art PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475863/normal_6012e3263e173.pdfIn PDF document text
    • http://rotepojisox.iblogger.org/teaching_strategies_list.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/chjlKjf/wedding_cake_cooking_decorations_nz.pdfIn PDF document text
    • https://pekonupag.weebly.com/uploads/1/3/2/7/132741447/luxuretibeke.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/6ygipha/supertux_2_play_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_6002e73d98ab3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459629/normal_5fe2125cdf473.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/7604508.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/2516760.pdfIn PDF document text
    • https://xalanuxezofoki.weebly.com/uploads/1/3/4/3/134309931/540df5.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/gCrUp4U/8155958636.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475212/normal_6007baf145301.pdfIn PDF document text
    • http://fesebenawasoz.iblogger.org/87088242188.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatafefot.rf.gd/shazam_encore_apk_full_programlar.pdfIn PDF document text
    • http://kurejob.epizy.com/tokelifobediwojoraf.pdfIn PDF document text
    • http://kuxiguzemafuj.rf.gd/nolezovudi.pdfIn PDF document text
    • http://petizitopebil.epizy.com/state_capitals_quiz_with_answers.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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 5012 bytes
SHA-256: 8c398db481149862cbb529dc6fe9fd1d3982e5a674ae909422df4be2967179a2
font_01_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 10272 bytes
SHA-256: 69aa7af1137cfe9c64ab1d221aafa92f1d0335965a64564567344e8668dba8d0

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