Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d18182c79ea593b…

MALICIOUS

PDF

97.5 KB Created: 2021-03-28 10:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 68a0b3b908e49f21371954cb18113a36 SHA-1: 4131441fc8bcac408a9ca977e88ccadc170376ec SHA-256: 5d18182c79ea593b2dedda0bdac1bfc1a628de63511f555a9f15b6a5326f1787
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=hacks+for+csr+racing+2 PDF link annotation
    • http://nubolutlion.xyz/how_to_disassemble_ingenuity_inlighten_cradling_swingamk95.pdfIn PDF document text
    • http://agreevudb.rest/fidanafuxuvzhn2.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/05c545ec-ebb4-4cba-ba84-f1d548dac04e/understanding_computers_today_and_tomorrow_15th_edition_chapter_1.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_c4ad38535a404376a9336b3683ff445d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/salesforce_lightning_reports_not_loading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf466c8a-315a-42af-9019-def2c4d0ad17/the_secret_garden_book_controversy.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_5e18822060b54b2fb4a99597b414bdeb.pdf?index=trueIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_5bcd3bf3c56644f5ae55eec841d26acc.pdf?index=trueIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_ac85d1da74ee4d07b297f9b765d05eab.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_76596cc7a0ab43b79bb52dd4303475c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25ef69e-39a8-4183-ab16-106a67d95e25/what_is_the_concept_of_peace_in_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0abe455-8bc8-400a-a3fb-f1a2d7f9f0bb/excel_spreadsheet_download_2019.pdfIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_f0f194c697644647a7e9991bb205b5cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/wumujuzezomazo.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/51177543789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d00160-e0ea-4ad8-a83b-7c97faef5677/how_to_dispose_of_smoke_detectors_in_new_york.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_ae4a83b7b8f4448092d559d206ff2a6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/undertale_piano_easy_sheet_music.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_687065e2d60d4f58bbd23599067bf38f.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_off00013ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC7 5176 bytes
SHA-256: c7473400ae71f49b6af6d91dff4faa6aaf8018e0e7ab965a691b503dc6c33ccc
font_01_sfnt_off00014c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C77 13580 bytes
SHA-256: a0b7f672f9497b206409a22706269d0b756aa6e1d4a3ceecf6925ce4d5ee56a3