Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9609421afeb76e8…

MALICIOUS

PDF

77.4 KB Created: 2021-02-27 23:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5159dd9a9d16b978a7df349d4cbe0f58 SHA-1: 71ebde1d36aa4cd40657fb30baf9d36848572667 SHA-256: a9609421afeb76e89d227d0338c4acddbb06f8f1b3735b3d59ba321eb7ed3fed
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://maypoin.ru/award?keyword=what+is+a+certificate+of+readiness+in+divorce PDF link annotation
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/376625d0.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/69553370317.pdfIn PDF document text
    • http://tosety.xyz/lelivopufib1aj.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/lexus_gs_350_f_sport_specs_2015.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/91858858155.pdfIn PDF document text
    • https://bupitubijas.weebly.com/uploads/1/3/4/0/134040922/633ad9.pdfIn PDF document text
    • http://xxlmature.site/baofeng_uv-5r_programming_ukbcy1o.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/gutugoroxesijo.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/sosupejuxofedo/buruxukuxusaziladefotedar.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/xaketukuz.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/cambodia_tourist_visa_on_arrival_application_form.pdfIn PDF document text
    • http://tudalumovadir.epizy.com/where_to_donate_clothes_to_veterans_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/broken_vessels_piano.pdfIn PDF document text
    • http://wasokutuv.epizy.com/website_design_questionnaire_template_doc.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/27034612246.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/application_form_for_us_visa_in_jamaica.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/lemoz.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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 5152 bytes
SHA-256: bac6f087c37236cfd7f716a92d5b2eadfdd6a677329cf0f4622722a8c2078718
font_01_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 10984 bytes
SHA-256: 5e678d7aedf94145e78a370edda175a637f534055aa06580bac57775fea51faa

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