Malicious PDF — malware analysis report

Static analysis result for SHA-256 619c4e83522e4207…

MALICIOUS

PDF

76.0 KB Created: 2021-05-07 09:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1042a8cf4453f9def9b80732c628d804 SHA-1: 5957a56d91f0eacfc15e98c4947c1239f4dcf1d1 SHA-256: 619c4e83522e420738000fb5cb30b9cf33dc2992543f1d5fba2ae700e6a04050
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

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://resalured.ru/strik?utm_term=free+safety+toolbox+talk+topics+for+construction PDF link annotation
    • https://cdn.sqhk.co/pedajobu/cepHEB6/gadibaximugubavige.pdfIn PDF document text
    • https://fodivavix.weebly.com/uploads/1/3/1/4/131483454/ludowofopebi.pdfIn PDF document text
    • https://cdn.sqhk.co/rawolobi/Vcthjig/agni_natchathiram_tamil_full_movie_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_60360412325e8.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/xefusenapisomewixaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462678/normal_60089af5ead71.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/czcgdN0/oppo_f5_lock_screen_password_reset.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5fee307c2c472.pdfIn PDF document text
    • http://metarapuw.mypressonline.com/467789669.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/rapidex_english_speaking_course_free_download_in_urdu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_601fbed9525c483ebb930634f40b65cc.pdf?index=trueIn PDF document text
    • http://wuwopeluba.epizy.com/botepaxawasan.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_75837ab6b232479bb7e91a0e35fe3172.pdf?index=trueIn PDF document text
    • http://degivenumi.epizy.com/reading_strategies_book_free.pdfIn PDF document text
    • http://puwufunajexawi.rf.gd/what_time_is_the_jupiter_saturn_conjunction_uk.pdfIn PDF document text
    • http://fabevax.myartsonline.com/cfa_level_1_curriculum_2020_download.pdfIn PDF document text
    • http://xotesevuves.epizy.com/damigifijuvevozi.pdfIn PDF document text
    • http://zuruvipusagevi.epizy.com/frp_developer_options_apk.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_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 5336 bytes
SHA-256: 5d8f1267992a685106f5d809dd1c2cb062c2e7d12edd2cf60cd10e7732d55cc5
font_01_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 10752 bytes
SHA-256: f6fa5bb596148fc00a427a30294b5814e3b737bfc0cc90aba8b7863ea84cb0d3

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