Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b55f3f71afff71e…

MALICIOUS

PDF

82.1 KB Created: 2021-03-20 06:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: abf8bc691a2260294facb5b58294a429 SHA-1: 49e1d1160af82bd5391b2623fbd8276d432a7cf5 SHA-256: 3b55f3f71afff71e6834f07bb8f8ef9fb487de20ee46f13a69746b8b794c6629
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. 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 0.9993

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dafemum.ru/award?keyword=learning+bookkeeping+pdf PDF link annotation
    • http://jonusawa.iblogger.org/interim_budget_2020_speech.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/lotozex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481825/normal_5ff116c2dfd98.pdfIn PDF document text
    • http://ravasixojodari.mygamesonline.org/catalogo_bticino_tableros.pdfIn PDF document text
    • http://abreudesigns.com/unwanteds_quests_book_7_summary2iz9f.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/dF6Yij8/kik_application_download_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6025c244d424e.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/vunokegume.pdfIn PDF document text
    • https://cdn.sqhk.co/zokasejiz/LwI9gfZ/fuvuxobasizibafazip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495387/normal_5ffe193f9a5d8.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/233414757596mxae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_604ae1627a480.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/7sqKgey/untouchables_tv_show_1993.pdfIn PDF document text
    • http://ag-management.space/zodunemipaliguwekakb4166.pdfIn PDF document text
    • http://delaem-sami.online/animation_pictures_free_for_pcpmwxq.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/ibjgLge/pigejatusavorenekenu.pdfIn PDF document text
    • http://nopisodozig.66ghz.com/tom_clancy_movies_on_amazon.pdfIn PDF document text
    • http://dorightschool.com/calculator_apps_download_iosg9wlq.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/igwWP5e/stick_with_it_definition_synonym.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwemijawikipo.epizy.com/valirajiv.pdfIn PDF document text
    • http://tedijafubivot.epizy.com/ivanhoe_nsw_weather_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d043f695-83fc-47e5-a5cd-d50f9644850f/misspent_youth.pdfIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/speaking_english_as_an_american.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d039e0ff-12e7-451e-b61d-9e902a9c9dbb/katesukakivulafaku.pdfIn PDF document text
    • http://nidubopavoxu.rf.gd/technical_drawing_tools_and_equipment.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_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 5144 bytes
SHA-256: ef2a772ea7d632d3521fd1ded75059ec72b2650f76526e3ca8431a8a4b188aab
font_01_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 11096 bytes
SHA-256: ac2f2e4f2430154d3620badfe2505f29d148b6db868131730a539eb3fcdc4d99

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