Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc83307052942dac…

MALICIOUS

PDF

92.8 KB Created: 2021-02-19 22:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 336836276b8c1d731fdbe0d753f320fd SHA-1: bc3e7cf14addfecb2ab39d654faa0d25406a963e SHA-256: fc83307052942dacc570c560dc1697ce642509b251cc3ef0c3e5325f2a7fac23
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://crophysi.ru/strik?utm_term=resumo+a+divina+comedia+de+dante PDF link annotation
    • http://discovljzg.fun/priority_pass_form_hdfcby412.pdfIn PDF document text
    • http://pusutotini.iblogger.org/68778864573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_601987c5144db.pdfIn PDF document text
    • http://excschool.ru/nimowogekodijijoda1k45t.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/Njc4jie/syfy_shows_worth_watching.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/dPo71M6/mermaid_photography_myrtle_beach.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/cjeFbv5/my_hero_academia_timeskip_fanart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425768/normal_5fff4b4eed49d.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/NihP6hd/vugidevowukodevetelika.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livibodake.rf.gd/worship_house_project_4_songs.pdfIn PDF document text
    • http://bimuvugibane.rf.gd/sovekebo.pdfIn PDF document text
    • http://mapureju.epizy.com/analise_de_risco_de_credito_bancario.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/47925525950.pdfIn PDF document text
    • http://datidalumoz.rf.gd/primary_active_transport_worksheet_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 5024 bytes
SHA-256: b10785394702a597b0c404f7552ead662ba6a16cf84f75d0f9c8526839059b35
font_01_sfnt_off00014000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14000 12240 bytes
SHA-256: bbdd3760089f4619cc1331bd416eebd53974142efbbaea47d5bbc45d7507bb70

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