Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c26ed492225e3a…

MALICIOUS

PDF

84.2 KB Created: 2021-03-26 03:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b66e31ee1aac325544fedab9493fe1a3 SHA-1: 210daf9c65f6f34eda8033c0ecf0e99dc2a1aac3 SHA-256: f8c26ed492225e3a0742af80bb1361d28a802109c07fc3f140009f11a49c983c
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of embedded URLs suggests an attempt to direct the user to malicious sites for further exploitation or credential harvesting.

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://kuzutuzo.ru/wix?keyword=shakespeare+language+worksheet+british+council PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4526930/normal_600f612e241bc.pdfIn PDF document text
    • http://comp-arenda.site/software_tester_job_description_samplebnwqd.pdfIn PDF document text
    • http://digtalcaliper09.xyz/building_blockchain_projects_bookw7csx.pdfIn PDF document text
    • http://nudistoff.club/why_is_chrome_disabling_flashkinpi.pdfIn PDF document text
    • http://littlenat.space/zozetalolojogi9m7ex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_6015c661096c3.pdfIn PDF document text
    • http://discount50.pro/diono_radian_rxt_cleaning_instructions2iqir.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/what_is_the_moral_of_the_lion_and_mouse_story.pdfIn PDF document text
    • http://wiinorama.fun/zig_zag_cactus_for_salefiqj0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_5fdc4f45b50bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_601bade7ed85e.pdfIn PDF document text
    • http://fruit-italy.space/chevrolet_cruze_2013_service_manualqsqva.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/xogasisuwuxinesasi.pdfIn PDF document text
    • http://good-production11.site/nexiwufomasufizakomoflvk8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_4e3fc4d9fd2447a7b78a29057a8db17b.pdf?index=trueIn PDF document text
    • http://pivimufe.atwebpages.com/how_to_make_creamy_garlic_butter_sauce_for_steak.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/how_do_i_calculate_pool_pump_flow_rate.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_cf8d14fb1d674326b3396611ebe16006.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b33d56-4c41-421a-8400-17bd8ce4c690/jersey_mikes_veggie_sub_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acec57fe-0f74-47f6-a03d-93b5511d3fae/jexawupiditorufaxij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1dc93e-7e73-494d-8334-138e6d8401f4/sig_sauer_p238_leather_ankle_holster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b934c1-d7bd-43db-8a03-e0720861e918/62183239117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b950992c-b385-40e1-9edc-ac09a23343c5/ps4_games_suitable_for_7_year_olds.pdfIn PDF document text
    • http://faxevimisosideg.myartsonline.com/fapujoninova.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_5f7dbfed0c5b40eaa32a0c274b786b8b.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 5592 bytes
SHA-256: 824e2afae8159c0ed25a202723880101a533c5e832ea0b4d43f8e29da636269a
font_01_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 10348 bytes
SHA-256: 4d9c28da17ae5cb2e52bd3d58cbfabedbffeec85ec24879bfe7216b49f643e71