Malicious PDF — malware analysis report

Static analysis result for SHA-256 481ecd6e418585bd…

MALICIOUS

PDF

128.9 KB Created: 2021-04-18 16:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b6b6b50d48668b45fbd51a3b171b42fe SHA-1: 7bc081b624bab1c9133d4f19769373604dda9eae SHA-256: 481ecd6e418585bdc7c741042b4dbc6c7038ecb5cfa119ca8756a1c52656a547
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm hosted on disposable domains. One prominent URL, 'https://vilenefex.ru/strik?utm_term=jeu+de+cartes+a+2+facile', is flagged as suspicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the linked sites.

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://vilenefex.ru/strik?utm_term=jeu+de+cartes+a+2+facile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501233/normal_6026d99b4f862.pdfIn PDF document text
    • https://revunisukigi.weebly.com/uploads/1/3/4/8/134849871/mijegevogufelag.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/1047899.pdfIn PDF document text
    • https://kuwovuvonix.weebly.com/uploads/1/3/5/9/135971109/xulegejeperot-zulowivedokawed.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/he0gfvQ/world_championship_wrestling_wwe_network.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_605fdea5386c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_603714b238e16.pdfIn PDF document text
    • https://nufosizusom.weebly.com/uploads/1/3/4/6/134619592/8786417.pdfIn PDF document text
    • http://negodebozebe.iblogger.org/ethanoic_acid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483623/normal_60190cdc66432.pdfIn PDF document text
    • http://mapugukabazewu.scienceontheweb.net/does_god_forgive_everyone.pdfIn PDF document text
    • http://vomoliba.scienceontheweb.net/3900820564.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/yU1Fkjj/game_unblock_me_free_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/m5U1Zjj/3452943613.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/45518125113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_60616b23a4558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jorasixu.myartsonline.com/alone_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/2003_ford_focus_cylinder_head_temperature_sensor_location.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/how_do_you_reset_a_vending_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/can_paint.net_open_svg.pdfIn PDF document text
    • http://wutivufugisev.epizy.com/dixuwebekixupe.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/59718661790.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_off0001a373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A373 5136 bytes
SHA-256: 8d573a3a88f08b2a144fa78820c6829dacc0fb2801e6bce53983e966ffe926e4
font_01_sfnt_off0001b4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4F9 13452 bytes
SHA-256: 77f09ac7edbdfd231d64830d146a4b594f22305decdd7b8362c3175286c96edb
font_02_sfnt_off0001df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF6A 16080 bytes
SHA-256: bf2bb651642035a19e1b8bf5dc55c4db7948913289cd11d1f66f0c65c0fed8c7