Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ef22698a7920f5…

MALICIOUS

PDF

109.0 KB Created: 2021-04-05 21:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 25669e1a6ef15d101e61c0ace8b541ea SHA-1: f515d899de85769e02a921da77e62e4c4600ac4e SHA-256: c2ef22698a7920f52503dee300a4d3eb3b8eadc9ae8ceff2e8c43fe787b34c50
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm and a phishing/trojan. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational materials, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jacksth.ru/award?keyword=big+ideas+math+advanced+1+teacher+edition+pdf PDF link annotation
    • https://nilizexuv.weebly.com/uploads/1/3/0/7/130739046/0f906a7e5.pdfIn PDF document text
    • https://cdn.sqhk.co/muxizupemof/2gejeX7/faerie_dragon_pet_wow_classic.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/higtihf/lanax.pdfIn PDF document text
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/sadupiserapalexal.pdfIn PDF document text
    • http://zowuzigokov.22web.org/90016596552.pdfIn PDF document text
    • https://nanewibogexuro.weebly.com/uploads/1/3/1/3/131382113/dureguluja.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/definition_of_business_cycle.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/gfhnjoL/spartan_firefight_apk.pdfIn PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/19e25332a751.pdfIn PDF document text
    • https://pemalerokefoge.weebly.com/uploads/1/3/1/6/131606165/aa75a308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/912a8efb-fadd-4c13-846b-b964479e1980/passato_prossimo_o_imperfetto_esercizi_con_soluzioni.pdfIn PDF document text
    • http://jinugiwi.atwebpages.com/molarity_formula_in_chemistry.pdfIn PDF document text
    • http://gaxufaxurawago.epizy.com/autocad_electrical_2018_free_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/036e0ead-a46b-4d63-b58f-10accbc63973/97752080063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fba71dc-365a-4cc9-a77a-ec07568d0c9a/wegaxizamepeparej.pdfIn PDF document text
    • http://fekugulivajul.epizy.com/city_planner_geometry_project.pdfIn PDF document text
    • http://sovogezo.atwebpages.com/critique_of_everyday_life_lefebvre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b42cbd5-1fe4-431c-892d-a62e1013f4c7/merriam-websters_pocket_spanish-english_dictionary.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15751 5700 bytes
SHA-256: 73172391c61be29f9d94346492fe5d1518ec3f4caff263b7b221ef34d0dabbd8
font_01_sfnt_off00016aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA1 11004 bytes
SHA-256: acbb0874cb70a0d6e441df9bbca2276c55fc615c7fb91e9dd1095f530e08ee25
font_02_sfnt_off00019054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19054 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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