Malicious PDF — malware analysis report

Static analysis result for SHA-256 c945d0bedd416fc8…

MALICIOUS

PDF

113.5 KB Created: 2021-03-11 22:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41920546bb7b93b9db729d5b0d0cf037 SHA-1: 085c25403366c9b261d71c9d26bb9a077c6701ef SHA-256: c945d0bedd416fc89eb3817704bddef96606e4e63b9f89e636e87c49372ac126
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting services. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://soxebez.ru/123?utm_term=oral+cancer+information+in+marathi PDF link annotation
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/sotuzadubuzoxisag.pdfIn PDF document text
    • https://tejalegevususo.weebly.com/uploads/1/3/1/6/131637178/tifesoxobovor.pdfIn PDF document text
    • https://wejapunikiver.weebly.com/uploads/1/3/4/2/134266614/7424445.pdfIn PDF document text
    • http://bukudix.getenjoyment.net/libizodomizubabugowu.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/DgheX7H/67214451182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_600ca117ee44f.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/vefaxalimizabik_ludegosi_kitamoderujewa_xepezuzolezek.pdfIn PDF document text
    • https://zunukewonodej.weebly.com/uploads/1/3/1/4/131453615/2007afad6a3.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/qgiCgja/christian_worship_songs_lyrics_and_chords.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/lixofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495536/normal_603bd94cb1ec7.pdfIn PDF document text
    • https://rapovesotupoma.weebly.com/uploads/1/3/4/3/134353038/6077113.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/3519177.pdfIn PDF document text
    • http://jawogili.22web.org/resumen_del_libro_el_escudero_de_dios.pdfIn PDF document text
    • https://berarenojinoz.weebly.com/uploads/1/3/4/7/134737003/lurolalalamukof-sudobadarixivex-vanugew-tixupepekiza.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/keninelimujub_rinoxup_gesaxemobejub.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/hgEjh3d/96573383794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5ff39cf218daf.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/0hfqjcV/national_corvette_museum.pdfIn PDF document text
    • http://fexuvukenix.22web.org/86298467322.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/440be88ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_601df5861f27b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mikijanux.atwebpages.com/jusavigoxoxov.pdfIn PDF document text
    • http://taluzeze.rf.gd/inspector_general_report_december_9th.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_off00017fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB0 4968 bytes
SHA-256: 7e2f678a00d6ccfbc54500430f850f0c484a6249ae110eca525a78f52a4aa84f
font_01_sfnt_off0001906b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1906B 12336 bytes
SHA-256: 4867322ae31b2c7d03b6a93d98ae4e45a8477e67a3e890fa7474a2161be28263