Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58e8231d0a252e1…

MALICIOUS

PDF

71.1 KB Created: 2021-02-17 08:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a4b60433e3c3ed7e806d59a3d551ea82 SHA-1: 1ce0a5daf254cb2f34de2d46cda1e3873092dfa3 SHA-256: d58e8231d0a252e1f451cb7a744c4c83bb328cfb24e02ca43ae57f481b1dacce
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, appears to reference 'Spelling numbers 1 to 10000', which is likely a lure to disguise the malicious intent. The presence of external URIs and the link farm heuristic strongly suggest an attempt to direct users to potentially malicious websites for SEO manipulation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://baarspo.ru/strik?utm_term=spelling+numbers+1+to+10000 PDF link annotation
    • http://prequester.online/jagatsinghpur_balikuda_weather_reportnhab1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5ff226a4570fa.pdfIn PDF document text
    • http://copyright-supporthelp.com/harpoon_lagoon_jellyfishh6ov0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484631/normal_5ffaf2e215684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443812/normal_601073e21fe1f.pdfIn PDF document text
    • http://goxonivibewe.22web.org/dirijobarofe.pdfIn PDF document text
    • http://neyroskakalka.site/summertime_saga_eve_guide7fn3m.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/2293198.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/wemofodi/angular_2_formgroup_disabled_input.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/crossword_answer_for_excessively_sentimental.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/ribbon_banner_template_clipart.pdfIn PDF document text
    • http://dawegad.rf.gd/bridge_to_terabithia_screenplay.pdfIn PDF document text
    • http://kinamanerat.epizy.com/libro_business_model_generation_en_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/cursive_worksheets_free_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/58917350098.pdfIn PDF document text
    • http://razafif.epizy.com/jemofujosudulilenenarij.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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 5364 bytes
SHA-256: 646bfa41730846ab5da483dafe9843be62398a122a882665a700abb2b8e24a5c
font_01_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 10476 bytes
SHA-256: 73d25100292752d5c8ede152a3b9d13bfc299b02357c85ea64814918667eea62

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