Malicious PDF — malware analysis report

Static analysis result for SHA-256 420a050dd35c0a5d…

MALICIOUS

PDF

77.8 KB Created: 2021-03-28 18:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 023ccc8afe582dbf9583d4f0460739dc SHA-1: 6095787073a9aaba18b536440e29bd263b72a007 SHA-256: 420a050dd35c0a5d125dd1af1d8f812d85f6a406a509efa2075c43dab1d53e71
126 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded document body text appears to be corrupted or obfuscated, preventing a clear understanding of its intended lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://kuzutuzo.ru/award?keyword=amazon+case+study+strategic+management+pdf PDF link annotation
    • https://cdn.sqhk.co/zebekufalafi/hcq3ieL/52939876782.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/eWhgtxb/youth_dirt_bike_racing_jersey.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/zitofoviduzejosapo.pdfIn PDF document text
    • http://kuliwegi.sportsontheweb.net/derizodawijaxivukavi.pdfIn PDF document text
    • http://zajilakofudo.scienceontheweb.net/gumefujopibinenojen.pdfIn PDF document text
    • https://nupinegudoxaxu.weebly.com/uploads/1/3/5/3/135350485/zemisivuza_finitarew.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/samsung_bd-p1590_blu-ray_player_remote.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/baxunuzipuregali.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/8958350.pdfIn PDF document text
    • https://vedoguru.weebly.com/uploads/1/3/1/3/131380953/1866427.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/labenulagowezoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_95284a5eb4d84824b2744a93e8bcde49.pdf?index=trueIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_9b1af46e6e1140c495f75dac6b71913d.pdf?index=trueIn PDF document text
    • http://pavabiza.atwebpages.com/mrutunjay_marathi_kadambari_download.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/samevuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/68744359020.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/local_area_calling_guide.pdfIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_f414ce13cf734470abc21c9bb04523e6.pdf?index=trueIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_28ffdef99c094d8fb08a05c9446e8386.pdf?index=trueIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/circulatory_system_diagram.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_060d7d1333194999bcafc7ab9a399346.pdf?index=trueIn 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_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 5584 bytes
SHA-256: 0edc5239339c044702ad4ce8e35170c5154982aa58c699cdb4150314f15440a9
font_01_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 10284 bytes
SHA-256: 7325ba1c062028d79083f5fe0e4c3dae0d1cf391547368948eef0b902b5dc875