Malicious PDF — malware analysis report

Static analysis result for SHA-256 309cc3ea5b56d191…

MALICIOUS

PDF

85.2 KB Created: 2021-04-07 03:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c50bb8c83406d84d5afd05a10ace87c SHA-1: 289b51fd74660e6f620a73e7354957665987f8fb SHA-256: 309cc3ea5b56d191ce57bd4978ffba5afa6e3def325b8a604db4c12057e4d702
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to a domain associated with SEO manipulation or phishing. The presence of many links to disposable hosting and the ML detection suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xajibur.ru/wix?keyword=8+ball+pool+unblocked+k10
    • https://tutitobogin.weebly.com/uploads/1/3/4/4/134485970/dce76f8d.pdf
    • http://leseweremizew.scienceontheweb.net/python_para_analise_de_dados_download.pdf
    • https://kegebexik.weebly.com/uploads/1/3/4/5/134590944/tifokematagibemexida.pdf
    • http://neriwor.medianewsonline.com/vigantol_bayer.pdf
    • http://ruboperuba.iblogger.org/home_improvement_tips_2020.pdf
    • http://tarusexozof.iblogger.org/warframe_size_steam.pdf
    • http://fogejebimo.scienceontheweb.net/probiotics_review_article.pdf
    • http://zexofezureza.iblogger.org/similarities_and_differences_of_impressionism_and_expressionism_venn_diagram.pdf
    • http://tiwilofojifig.sportsontheweb.net/blood_group_a_positive_diet.pdf
    • http://wabaxifejem.sportsontheweb.net/8485819786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://degeluvugo.rf.gd/gifukizuxi.pdf
    • http://renunuxuxalebav.epizy.com/daily_cash_flow_statement_format_excel.pdf
    • http://xowobovu.myartsonline.com/asmaul_husna_anak.pdf
    • http://wanabugakal.rf.gd/bowditch_traverse_adjustment.pdf
    • http://wafepugi.rf.gd/82151975361.pdf
    • https://s3.amazonaws.com/wozoxub/dezefobulifil.pdf
    • http://gezixus.myartsonline.com/brassica_oleracea_var_viridis.pdf
    • http://koxosam.rf.gd/how_to_change_resolution_on_mac_external_display.pdf
    • http://semomudunetowa.rf.gd/najawekakinupigep.pdf
    • https://s3.amazonaws.com/fizup/gipavatuzepitili.pdf
    • http://wapasexuridodo.epizy.com/arterial_line_insertion_procedure.pdf
    • https://s3.amazonaws.com/wifiduxezo/34962691111.pdf
    • https://s3.amazonaws.com/toguvaju/50318562658.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcc.bin
f6ec1bce8c648036b125bb91e75a0d0afc2ab5f5441f570a431572dbde3e90fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 5288 bytes
font_01_sfnt_off0000ffd0.bin
a1f1b781af871e8643ec9c39ccdabb681d997ecbd9bb5b10a7841a4087cdbcb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 1832 bytes
font_02_sfnt_off0001089a.bin
8ba87311c3a92a5161bfe3123fd8991a6771511eee958b5acc5afe0c10997548
pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 12224 bytes
font_03_sfnt_off00012feb.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEB 16204 bytes