Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a9b4b80c49a864…

MALICIOUS

PDF

74.0 KB Created: 2021-02-26 00:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 475a5fc83d2ac09bd2939f0f106d6996 SHA-1: 598978e4b9a117a292768b1859e971e970e04ec0 SHA-256: c2a9b4b80c49a864cde5e2563985d3905604a2d03a4f84cd7ea34594fc10f8ca
126 Risk Score

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://seumenha.ru/strik?utm_term=how+much+do+senior+mechanical+engineers+make PDF link annotation
    • http://rijewomel.scienceontheweb.net/how_to_draw_a_turkey_easy_step_by_step_for_beginners.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/tekezufejegiridojo.pdfIn PDF document text
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/kukibomotufa.pdfIn PDF document text
    • http://paselon.getenjoyment.net/elitebook_6930p_battery_price.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/sibakig-zipukavep-rapijolis-vurosula.pdfIn PDF document text
    • https://wopuvonu.weebly.com/uploads/1/3/1/3/131384791/92d44.pdfIn PDF document text
    • https://zedowegekinusil.weebly.com/uploads/1/3/3/9/133997302/wigagatujuta_nabupo_doziwamu_nadeno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimixof.onlinewebshop.net/fundamentals_of_database_systems_github.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/31508407932.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/pojoxonefofanojodez.pdfIn PDF document text
    • http://xejarejunap.rf.gd/sd_card_reader_for_iphone_and_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/fanreport_bgld_2_liga_sd.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/what_size_battery_for_2008_dodge_avenger.pdfIn PDF document text
    • http://rakojumetaxo.epizy.com/59885923867.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_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 5468 bytes
SHA-256: 301b79a03946b1db331ed1cddf5b0fc9af07988feef15e417dee33cf2405f4e1
font_01_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 10780 bytes
SHA-256: fa612d54e1bf0c3d743eac3c2a4e1156d87d77a85f0369de9a51e992800616a3

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