Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7b095b030b5717…

MALICIOUS

PDF

78.7 KB Created: 2021-03-03 23:03:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d5b87bccb78e2d9f8b27dd7308c6a200 SHA-1: 0feb28cb481334310259265f777570ac7515e047 SHA-256: bb7b095b030b5717422cef6c110e74c90f4a9e6d614e165219d6827b6207e83e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or SEO spam operation. One prominent URL, 'https://resalured.ru/strik?utm_term=husqvarna+riding+lawn+mower+won%2527t+start+no+clicking', appears to be a lure for search engine traffic. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=husqvarna+riding+lawn+mower+won%2527t+start+no+clicking PDF link annotation
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/4835452.pdfIn PDF document text
    • https://puroporutenes.weebly.com/uploads/1/3/1/6/131606954/kawav-forutitufe-xuvuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/emmjF7E/harvard_business_review_article_on_diversity.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/mphaibR/jaxitebokagikabobaxike.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/haLgjja/mitazozexusifa.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/letapilebi-mufejufile-zolebogapag-tadaranudezupaj.pdfIn PDF document text
    • http://jipigebewojafof.22web.org/ejercicios_de_matematica_financiera_interes_simple_y_compuesto_resueltos.pdfIn PDF document text
    • http://fuwefepor.iblogger.org/thompson_alleluia_ssaa.pdfIn PDF document text
    • https://cdn.sqhk.co/xomifinetepi/sZjjhgo/gukad.pdfIn PDF document text
    • https://zutelosedetadof.weebly.com/uploads/1/3/0/7/130774966/rosamuzogekenana.pdfIn PDF document text
    • http://naguvogegexaze.22web.org/stihl_025_chainsaw_chain_oiler.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/rupatojuko/descargar_sapo_y_sepo_un_ao_entero_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/6th_grade_go_math_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/advantages_and_disadvantages_of_renewable_energy_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/95641061832.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/weber_sp_e-210_gas_grill.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/ttd_calendar_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/labelling_forces_worksheet_ks3.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/legal_services_corporation_annual_report.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_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 5596 bytes
SHA-256: 6169bbb6c01ae61a2c04e5a44ff19a5d7f2030ac54146d9acd70a980ab17294b
font_01_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 10280 bytes
SHA-256: 7275b403619a3a160ecd0705625b2a7b37210c21018ae1b38db5a46eeb1159de

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