Malicious PDF — malware analysis report

Static analysis result for SHA-256 121a619dd24436b2…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 12:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8140f2d67be41e8e7b3998cbfe702688 SHA-1: 57a89b2e31ca898ad44ca620ce00ab0d1f3d5ed8 SHA-256: 121a619dd24436b2255e7158f6a678d959ec2f39ab4102f9fb361ed211cd3286
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 0.9996

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://mezovuduw.ru/award?keyword=administra%25C3%25A7%25C3%25A3o+p%25C3%25BAblica+para+concursos+pdf+2020 PDF link annotation
    • https://cdn.sqhk.co/puxedimuwo/dz2Vngc/85300422672.pdfIn PDF document text
    • http://finansi-7.online/warrior_cats_website_quiz6gq5a.pdfIn PDF document text
    • http://xerijegodufiw.mypressonline.com/definition_of_agribusiness.pdfIn PDF document text
    • http://olx-delivery.cc/55999308310hzbel.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/4570378228.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/adjectives_comparison_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/eIajb8C/85629208847.pdfIn PDF document text
    • http://lowwsaw.xyz/merumeri1675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://seroritubofa.atwebpages.com/wadubapuxuleku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8303a4-b337-44f9-963e-f1731f10ca87/zaraf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a155c7-c0f5-4d8b-a021-905bd1ab620e/ambito_deontologa_de_la_filosofia_del_derecho_ejemplos.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_fe4ded01c0a546708c1d79b49c27aef2.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_4207def816f34a97a81964578224c292.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/carmina_burana_orchestra.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_2ced88aaa11e4e059bcf08c57df27834.pdf?index=trueIn PDF document text
    • http://sazoser.myartsonline.com/union_budget_2020_19_by_bankersadda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320b648a-01c1-4afc-9da8-afa127b2fe1c/lexusuvefevefizijarafil.pdfIn PDF document text
    • http://doritiwenoxa.onlinewebshop.net/bafizovupotibag.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/gaxavigowozituwimi.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_d23279972e3944d2b88171076d851e7c.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_d418c2ab34a1428db4367f934780c2bf.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_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 6320 bytes
SHA-256: 9ce18c0795a6c289a79ed9b8a42a25665137d4bf055843550f479cd6193c8643
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 12512 bytes
SHA-256: 6729da0afe6ef1642bf91acf67d6655041cc532ef7cfa766b1aee05e8c352c9c

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