Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bbe8be18eba009…

MALICIOUS

PDF

76.2 KB Created: 2021-03-23 23:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f14b66a8d7f0716f98ebb1d19046268e SHA-1: 92d4307d648ef4c1fa9d840fcfc8c58cb9208a3a SHA-256: c5bbe8be18eba009e921e18da32cd2475c005cea81259f4554353ee55fe653ce
156 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. 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 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=kenwood+ts-440s+dot+problem PDF link annotation
    • http://zijutepobabag.22web.org/the_little_norton_reader.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/20cf16e9bc678b7.pdfIn PDF document text
    • http://zawoxilejaku.66ghz.com/industries_qatar_annual_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443325/normal_5ff5097fd9144.pdfIn PDF document text
    • https://mawoluzapulumar.weebly.com/uploads/1/3/6/0/136082117/vabelazukubinag.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/d88f8d65f.pdfIn PDF document text
    • https://pekupepavipojev.weebly.com/uploads/1/3/1/8/131872203/1247031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486041/normal_60366ccb2a67f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490265/normal_5fd09fb387cd1.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/1427451c903e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_6004a75f967d8.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/4127780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467577/normal_6006905aba809.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/what_do_reactive_oxygen_species_do_and_how_does_this_affect_the_cell.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/2010_chrysler_town_and_country_touring_plus_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/bissell_proheat_2x_revolution_pet_pro_upholstery_tool_not_spraying.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/elevator_pitch_ppt_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/bricks_breaker_puzzle_mod_apk_free.pdfIn PDF document text
    • http://towupew.epizy.com/kawimipewuv.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/76410537288.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/los_crimenes_de_la_calle_morgue_resumen_por_capitulos.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_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 5356 bytes
SHA-256: 134c68038e8cdb35f883e0cb61f7a6879a3d545522339bd63ccee26cf5705c4c
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 10576 bytes
SHA-256: 269a6f2706592ebde112175d1f6857bbbd9d77662d84637d93ae986008d65379

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