Malicious PDF — malware analysis report

Static analysis result for SHA-256 794bd8514877d8c3…

MALICIOUS

PDF

89.8 KB Created: 2021-02-25 13:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f0804220afa369dcd9f2c5720703da5 SHA-1: 936bd4dbed3d5a33139b203bb712ec5de8ddac29 SHA-256: 794bd8514877d8c34b0ff02d5345f642c41de5c6e94b16a73a0aeb98638f57c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to 'science fair ideas', likely intended to trick users into clicking malicious links.

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://jottigo.ru/123?utm_term=what+are+good+science+fair+ideas+for+8th+grade
    • http://kozidozilujivox.getenjoyment.net/how_to_set_up_a_moultrie_mobile_camera.pdf
    • https://cdn.sqhk.co/lewikokezina/dug2nyU/99891311867.pdf
    • http://tazikuruwuwozu.22web.org/zosudo.pdf
    • http://gexomafe.mypressonline.com/dirt_devil_featherlite_canister_vacuum_reviews.pdf
    • http://pogawubujogeje.mypressonline.com/what_size_tires_does_a_2012_hyundai_sonata_have.pdf
    • http://razvivatel.blog/adam_alter_irresistiblefn0qn.pdf
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/gaduxot_zokej_badanawa.pdf
    • http://mgacessoria.online/7497078081mw8ai.pdf
    • http://forovasax.medianewsonline.com/30389104880.pdf
    • https://cdn.sqhk.co/vupapevixu/fiagegi/49761352600.pdf
    • https://jabudebixeref.weebly.com/uploads/1/3/4/3/134398441/7633029.pdf
    • http://static-start.top/1949163472pg878.pdf
    • http://piwakere.iblogger.org/sans_forensic_report_template.pdf
    • https://funogefoxareso.weebly.com/uploads/1/3/4/0/134041001/d28d0.pdf
    • https://zesasanigemi.weebly.com/uploads/1/3/4/6/134646319/tunevireku-mevijopawotesa-pevizovuw.pdf
    • http://xoxuvajes.mywebcommunity.org/lujunanujokojitumuzofoga.pdf
    • https://cdn.sqhk.co/kebubupoxiz/ihOggid/business_start_up_costs_tax_deductible_australia.pdf
    • http://vivadoctor.ru/jurnal_penelitian_akuntansi_biaya6wfl2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mamotupot.rf.gd/what_is_the_role_of_management_information_systems_in_accounting.pdf
    • http://giratas.epizy.com/editor_s_marks_worksheet.pdf
    • http://zefifimagami.epizy.com/comparison_of_adjectives_exercises_elementary_level.pdf
    • http://bifafogibuzaxi.epizy.com/80213924710.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120ed.bin
17589427b03fc25e05d83ac16d26f9d348b16ec5b86c9d3dec4a0b2397c2963a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 5456 bytes
font_01_sfnt_off00013386.bin
b4aff848d9e901016e3ab88bcf9605a4828d332da3f855fbf452e3f53bb8db31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13386 11180 bytes

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