Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93ee910434c0b44…

MALICIOUS

PDF

92.6 KB Created: 2021-03-22 21:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8e238e0f9bf8f03a8a9c0236f293a3e2 SHA-1: f11253deaad6205482ad489d8771252ced2d5257 SHA-256: b93ee910434c0b446fade68b42032903126f96bd089c3c3177f97113b48dcf97
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a link farm hosted on disposable infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be directing users to further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=libro+de+los+acuerdos+de+paz+en+guatemala+pdf In PDF document text
    • https://cdn.sqhk.co/nukusigemug/jihc5f0/blacksmith_forge_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386834/normal_600106704b964.pdfIn PDF document text
    • http://docita.fun/18999405247brtwq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476751/normal_5fdf8759cbbc1.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/iibifZJ/big_outdoor_light_up_wreath.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/ebGjaw7/water_slide_hotels_in_palm_springs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5ff060f616be7.pdfIn PDF document text
    • http://zdorovienashevse.xyz/how_to_write_a_macro_in_excel_office_3651tvyc.pdfIn PDF document text
    • http://fetidasobi.iblogger.org/keladavekakok.pdfIn PDF document text
    • https://cdn.sqhk.co/satofapo/apjfjis/dajosimojobunok.pdfIn PDF document text
    • https://cdn.sqhk.co/wivodojeg/fiighbk/rigigetobemewaxow.pdfIn PDF document text
    • http://center-san.ru/gekawftcsa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405654/normal_5febb3bc85faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_60110b655fba9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numapev.rf.gd/dakoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf28ba0-ed90-4628-9471-e72d1ee7fc6d/aprendizaje_basado_en_proyectos_ejemplos_biologa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1caa229-c9b8-4900-88ab-19d2cb45e982/90474809607.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_506d5c6765f7438c849fc742c65d8297.pdf?index=trueIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_5eac84da57fd407dacb7424582545563.pdf?index=trueIn PDF document text
    • http://voferumupisefag.rf.gd/brother_vx_1120_how_to_wind_bobbin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184cb4ef-6758-4c1d-bb96-ec73905e0cea/how_to_crochet_socks_with_pictures.pdfIn PDF document text
    • http://juvojifexuf.epizy.com/esquema_corporal_segun_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88af4eb1-a8d7-452b-bfff-b0b5be2988ed/kifox.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C11 5608 bytes
SHA-256: 78c981540c1d38e4760e827dd376cb08806165e9f63748515e56cd3ed9ae743d
font_01_sfnt_off00013f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F16 11768 bytes
SHA-256: 2bb32582b567096cd80449e78350f45f32896f3244edc5e5e8394e6346d666ec