Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b23d5045eb8289…

MALICIOUS

PDF

87.5 KB Created: 2021-03-17 14:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b01cb1d7d1cf78a3949d60c9fa5e6efa SHA-1: 8e3401b01224267009abb68ea7f665ee285b4c0e SHA-256: 33b23d5045eb8289f788e429c316f30cc782bd255b7c5360db0e5557b261b657
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, with one prominent URL pointing to a suspicious domain 'midufefew.ru' which is likely used to host malicious content or redirect to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://midufefew.ru/wix?keyword=dark+continent+hxh+anime
    • http://dixukegeruxu.22web.org/xaxojuwikub.pdf
    • https://vexuneka.weebly.com/uploads/1/3/4/5/134584550/9318133.pdf
    • http://bekopomulasebi.getenjoyment.net/nofafolaneximiwolasamaf.pdf
    • http://dizanixagegogin.iblogger.org/bloom_s_taxonomy_keywords.pdf
    • http://gosugas.getenjoyment.net/57825984887.pdf
    • http://naliputa.mywebcommunity.org/pepeguvob.pdf
    • https://minizaderi.weebly.com/uploads/1/3/4/3/134344024/fobiparoba_lisexukogisa_dijudoguluza.pdf
    • http://denarop.22web.org/humanist_manifesto_2000.pdf
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/muxexa.pdf
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/871fd97da1345b5.pdf
    • http://pasoxegidameso.iblogger.org/19773066410.pdf
    • http://vinuporabomod.iblogger.org/jojadumegaw.pdf
    • http://mavidodi.iblogger.org/bbq_flyer_template_publisher.pdf
    • http://vuvulusigi.scienceontheweb.net/solution_manual_and_case_solutions_for_crafting_and_executing_strategy_21st_edition_by_thompson.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pasifowon.atwebpages.com/best_air_fryer_recipes.pdf
    • https://uploads.strikinglycdn.com/files/c4c179b3-6cfc-499d-a2d1-8e3e4bcc5564/bmw_e90_service_engine_soon_reset.pdf
    • https://uploads.strikinglycdn.com/files/370cfd9c-5590-4bed-92c5-e267dc27f96c/26827528593.pdf
    • https://uploads.strikinglycdn.com/files/a7540807-94ac-4915-a584-3b95dc83bce0/samsung_tv_cablevision_remote_control_code.pdf
    • https://uploads.strikinglycdn.com/files/dce08f96-79ac-40de-b666-4653c6783a47/ritikenixezibamarofi.pdf
    • http://molodoku.rf.gd/duloguruwifezinovinixari.pdf
    • http://jokipuzovorije.epizy.com/how_do_i_pair_my_logitech_mk700_keyboard.pdf
    • http://zabipir.rf.gd/do_any_rivers_flow_south_to_north.pdf
    • http://vojitexaruwulo.rf.gd/vimugajoguxuv.pdf
    • http://kilibuv.rf.gd/how_to_attach_file_in_mail_merge.pdf
    • https://uploads.strikinglycdn.com/files/ac1f9d92-3f1d-4971-a8d1-7ce42b8b5c03/string_instrument_repair_shop_near_me.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdff.bin
1b5845074019b8a4e5daedbd3b93e70ffcaaf0c87a8d41ef4cf5f93336bb3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 4380 bytes
font_01_sfnt_off00010d52.bin
e60d66fd716915e24a4c0141de5c14bcdbc62599fdfadd9f4ffad4c8e8ae86eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 4748 bytes
font_02_sfnt_off00011d3f.bin
7f97c240c007e01b3c14c527388f90a6e96f7729be34db9aa4f84734eada0c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 11372 bytes
font_03_sfnt_off00014235.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14235 4324 bytes

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