Malicious PDF — malware analysis report

Static analysis result for SHA-256 936a233d6338912e…

MALICIOUS

PDF

71.8 KB Created: 2021-03-09 09:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 588e409322d3edb1a8f1e6cf9e2e1bbd SHA-1: bf62d4a506008d4a7fc0ffd079abf240021fd557 SHA-256: 936a233d6338912e41b96023fdb9acad7ce0495f2a5427c24f27373d00acc498
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's part of a link farm on disposable hosting. The embedded URL `https://mezovuduw.ru/strik?utm_term=cassandra+clare+the+eldest+curses+book+2` suggests a lure related to book titles, likely to attract search engine traffic and redirect users to malicious content. The presence of numerous external URIs and the link farm heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=cassandra+clare+the+eldest+curses+book+2 PDF link annotation
    • http://cardioactiveitalia.site/166858073pnayw.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/sajalegi.pdfIn PDF document text
    • http://lexaxak.mywebcommunity.org/windows_run_commands.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/69489687189.pdfIn PDF document text
    • http://manoligixave.66ghz.com/33349892533.pdfIn PDF document text
    • https://witaveju.weebly.com/uploads/1/3/1/4/131452735/22ff210849b953d.pdfIn PDF document text
    • http://fazudoladuvegig.22web.org/trail_tech_vapor_installation_francais.pdfIn PDF document text
    • http://lifegirls.site/xelozeronuvenujowovis0cc46.pdfIn PDF document text
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/zuwedalor.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/gagowuluzumurini.pdfIn PDF document text
    • http://lenudes.com/mtb_step_3cnba1.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/86732768787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viladanus.epizy.com/pressure_gauge_calibration_certificate_template.pdfIn PDF document text
    • http://sabozovitebem.rf.gd/t_shirt_design_template.pdfIn PDF document text
    • http://jujabezemaluwe.rf.gd/widulavov.pdfIn PDF document text
    • http://rasiwarivosifid.epizy.com/super_mario_sunshine_walkthrough_ricco_harbor.pdfIn PDF document text
    • http://gopogawamo.rf.gd/tivuw.pdfIn PDF document text
    • http://palakojum.rf.gd/sasawatigalalixatofidoxe.pdfIn PDF document text
    • http://vagamasorowiv.epizy.com/xujaxarasewavenejonegup.pdfIn PDF document text
    • http://vexujiwupif.epizy.com/nj_drivers_license_renewal_form_download.pdfIn PDF document text
    • http://zofopopisi.rf.gd/banakamo.pdfIn PDF document text
    • http://rojolegov.epizy.com/95659554909.pdfIn PDF document text
    • http://dokedajonanumi.rf.gd/korean_children_s_books_free.pdfIn PDF document text
    • http://puxejinasor.epizy.com/tamil_songs_website_name_list.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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 5268 bytes
SHA-256: 2036553e3101ded7eeb6f9db1217d7ddef895bf3a49d4b7c4b09e799f7d72338
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 11304 bytes
SHA-256: 227bc141b8765305e033899b3886a148d7c1c42258cbde4f6ed2e09d7dc1766a

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