Malicious PDF — malware analysis report

Static analysis result for SHA-256 750f90eaad6a8cf5…

MALICIOUS

PDF

87.9 KB Created: 2021-03-21 21:23:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ba7850adf3c6211f60214c0c802a450 SHA-1: 98e478b7f8c0c44991cb88753ec21483aea45947 SHA-256: 750f90eaad6a8cf5f96051fa8869320cb2dd9f3cc0a8d00aa79c0f8f5e341aef
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=kids+zombie+costume In PDF document text
    • https://cdn.sqhk.co/litalile/ObhiTjc/csr_classics_hack_ios_download.pdfIn PDF document text
    • http://vedojuburokag.22web.org/nojovepuniwamojokowibavux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5fd8459f82cf8.pdfIn PDF document text
    • https://cdn.sqhk.co/posuwumujome/2qjdUhd/warzone_tower_defense_free_download_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/ledusefugize/njaPdjc/vamerukowebomeluwepa.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/vegetarian_indian_cooking_with_your_instant_pot.pdfIn PDF document text
    • http://puwinowelin.medianewsonline.com/fadevozisamijuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5fee2ffcd7613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_5fe6e089e2444.pdfIn PDF document text
    • http://megikinazemurel.22web.org/excel_proforma_invoice_template.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/wdtv_live_firmware_rollback.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/73488454829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374839/normal_5fcf518ccf92c.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/gfibgc2/futibuzigegoxut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_6041627f21d03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejopiveb.epizy.com/71280319990.pdfIn PDF document text
    • http://jasesazolaf.myartsonline.com/trabajo_decente_y_la_agenda_2020_de_desarrollo_sostenible.pdfIn PDF document text
    • http://zatumowezixe.rf.gd/norujerajol.pdfIn PDF document text
    • http://zuzofigub.rf.gd/70589904554.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_3838935ba679416aac53d7b46bf6a477.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_aa63f4b06c064b989eaa3d7f49bc1892.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_d788fc17cfd0458eadd7253a83f57008.pdf?index=trueIn 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_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 4908 bytes
SHA-256: 8b51bf994ea86fdc112355d28fb4bc23d5c0908a5dcac8be90ca2df039178ed3
font_01_sfnt_off00012df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF6 10624 bytes
SHA-256: a7670b2fce006e19bbc193cda966938585e2dcc49dcfef952e0b8ce4b8399bb4

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