Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ed638753eaa92e…

MALICIOUS

PDF

69.9 KB Created: 2021-02-21 01:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f8cef2b1072fe708d62567495eca2209 SHA-1: 2896cf7d86193346686b58b2b993e58ccb238d1b SHA-256: a9ed638753eaa92e2803fa37716ab948ee3e8cbd9f33b74056628126164adb40
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'Lady blue jays softball' to entice users to click on malicious links.

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/wix?keyword=lady+blue+jays+softball PDF link annotation
    • https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/fe791796.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/13ac35d3f685f8f.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/igUigha/at_t_u_verse_tech_support_phone.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/82558116121.pdfIn PDF document text
    • http://genusadnlo.space/today_afternoon_weather_report5l4t7.pdfIn PDF document text
    • http://markettop.pro/what_to_do_in_your_early_20s7prj8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464056/normal_600becabac29e.pdfIn PDF document text
    • http://iqecoportal.ru/75238622601qhrki.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/ghyEygh/97470759096.pdfIn PDF document text
    • http://afracheat7.xyz/interview_questions_to_prepare_for_redditfr58l.pdfIn PDF document text
    • https://gebevomipo.weebly.com/uploads/1/3/0/7/130740462/8363625.pdfIn PDF document text
    • https://fuxusololozo.weebly.com/uploads/1/3/1/3/131380606/ec88d3e7674.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/XICjiJR/famivezanovewepokogawub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nivosifif.rf.gd/91623051651.pdfIn PDF document text
    • http://nowuzapifara.rf.gd/4698983658.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/cable_tray_fittings_revit_family.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 5064 bytes
SHA-256: fef2a4b9c037aba26e9369c48f7626ac11058059cf41ce05c486ea7a3eca715a
font_01_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 11104 bytes
SHA-256: b42f6243a300babdb89927aa7258c62b4fcdd5e715bfea3593e9aa75194ca216

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