Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b60dd4c6c51425…

MALICIOUS

PDF

80.3 KB Created: 2021-03-30 15:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a320fe178c61dcdbffa8825b011d526d SHA-1: 360d55a05d6de71c15988e2e7068867a9a782181 SHA-256: 66b60dd4c6c5142591db3e20da9268b0b06b06fad749a812e918c939a68a3309
186 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 disposable domains, suggesting it is part of a link farm designed to generate traffic or potentially host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://nipisod.ru/award?keyword=ignou+bed+application+form+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488574/normal_60501338de7a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443815/normal_5fd908ec0d649.pdfIn PDF document text
    • http://kugiriteno.iblogger.org/bhartiya_samvidhan_in_marathi_free_download.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/motorola_dcx3400_problems.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/concurrency_in_golang.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_602ebff9d3873.pdfIn PDF document text
    • https://dikafusit.weebly.com/uploads/1/3/5/3/135304370/vuwutudanazerudemut.pdfIn PDF document text
    • http://rajedat.iblogger.org/canon_ip1800_mac_driver.pdfIn PDF document text
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/xugunamobar-robaraxokasix-vilebixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_6034089be8c85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387244/normal_5fd34d8105834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_5fd7be8ba5cfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_604dbab07e1f4.pdfIn PDF document text
    • https://gumopaxegekugod.weebly.com/uploads/1/3/4/0/134018731/bedajumudezizi-vupekuzorelarik-bumivesur.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/5b244.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wilosokanik.myartsonline.com/catholic_social_teaching_human_dignity.pdfIn PDF document text
    • http://lutewefopuv.rf.gd/33732244571.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/wuwabijepomeboguwizemafot.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/82761648517.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/asian_games_2018_results.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_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 5648 bytes
SHA-256: 03de75fd5347db23e48c19d1c1d7a5634b7cde6589c08c32cba38c999ff75255
font_01_sfnt_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 10836 bytes
SHA-256: c03d845af574feec45ed093d8b270b85fe2726fde9cbba504a1f4c78b762e145

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