Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbfeadfb2f4181f…

MALICIOUS

PDF

87.3 KB Created: 2021-04-02 12:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3ec74ccf1ec8ec8fbce6786180c7a838 SHA-1: a3a43d3af109240f4398014020a7ffd3aa657b76 SHA-256: 5bbfeadfb2f4181fc1c29c3162ab5762384562098b9e6b10dc86e5ebd73bd879
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The primary URL, https://xajibur.ru/award?keyword=adjectifs+possessifs+singulier+exercices+pdf, suggests a lure to a site that may distribute malware or conduct phishing. The presence of numerous external links, many pointing to S3 buckets, further supports the SEO link farm characteristic, often used to manipulate search engine rankings for malicious purposes.

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 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.
  • 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/award?keyword=adjectifs+possessifs+singulier+exercices+pdf PDF link annotation
    • https://gapetomoje.weebly.com/uploads/1/3/2/8/132816106/a0833ce.pdfIn PDF document text
    • https://xevekefipozi.weebly.com/uploads/1/3/1/4/131406281/kibakolane.pdfIn PDF document text
    • http://mejumeroxara.mywebcommunity.org/solving_absolute_value_equations_with_extraneous_solutions_worksheet.pdfIn PDF document text
    • https://wipevotabekux.weebly.com/uploads/1/3/1/6/131607119/sirabubixiwovif.pdfIn PDF document text
    • http://vizemezezu.sportsontheweb.net/descargar_libro_6_claves_para_aprender_ingls_gratis.pdfIn PDF document text
    • https://sitadubudotewor.weebly.com/uploads/1/3/5/3/135335426/7711800.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/la_la_land_guitar_tab_city_of_stars.pdfIn PDF document text
    • https://giwizakewat.weebly.com/uploads/1/3/1/8/131857916/7327658.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/south_african_national_anthem_download.pdfIn PDF document text
    • https://wutodifutatur.weebly.com/uploads/1/3/2/8/132814097/076ad84e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/dipabixajepurokosasu.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/stock_market_futures_for_tomorrow_morning.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/xatakidosuluvovamaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5c2395-1764-427b-9977-2d92396c9eda/sudaranenudesepas.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/82608260950.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/segimazetemedizajokawepev.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/medosiwavokaxebifibut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2e3e36-83e4-497c-a507-221c21e52c74/95381266403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aeb7f47-bd76-470d-b566-2e35d7d423a5/baxilevokataj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 5248 bytes
SHA-256: 0b336ec1d6b7d7b99e6cbf50166431686b30c068ad78c5d8e3f747f2e20d7968
font_01_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 2884 bytes
SHA-256: 5c558618dff369c2b900462a2c05a26cd535293f5b4c043723e2c7e55145be0c
font_02_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 12888 bytes
SHA-256: ab7cf75dd822e481489e18c2a8d1dcd5f61130c09fcde007219fe1a8e27104b4
font_03_sfnt_off0001391e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 16280 bytes
SHA-256: 4be807b0233ff0583ba3e3c338d72484a7dd7cd6acd67bf69b141904071cc97b