Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbe832e7f300916…

MALICIOUS

PDF

71.8 KB Created: 2021-03-28 20:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 57a555a41337c19bc33f8b65a2947e57 SHA-1: c9bee192061d786cc3e0ad2cc0318414651ef799 SHA-256: 7bbe832e7f3009166af766417760585eacc8e4959bbcec3dfd9c51c6fd0fff7c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains keywords related to 'facts about universe pdf' and the authoring application, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=facts+about+universe+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393489/normal_603d05372536e.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/millennials_at_workplace.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386593/normal_5ff56ca0493ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_601ff7ce8e8f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_605ee1b699efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488316/normal_601eca94ccd90.pdfIn PDF document text
    • http://xofitazuregokud.mywebcommunity.org/34143590578.pdfIn PDF document text
    • https://sofozawaterej.weebly.com/uploads/1/3/1/4/131408917/jitumagakubek.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/piseladim-badokekokevekos-kelumu-misowirezaf.pdfIn PDF document text
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/3201521.pdfIn PDF document text
    • https://xajomorunineg.weebly.com/uploads/1/3/1/3/131383441/koxufovexedeno_mesamujitewe_sogopa.pdfIn PDF document text
    • http://datovufes.scienceontheweb.net/artritis_reumatoide_gpc.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/f6b340f6594bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_5fd66f33d1294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444378/normal_6039f7b06207a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fcb3caf1912b.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/preformulation_studies_of_biotechnologically_derived_products.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/xafawede_luwaxasal.pdfIn PDF document text
    • https://wejuwano.weebly.com/uploads/1/3/1/1/131163718/b2adee64a950.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5243f919-a130-41b5-ae69-7bcd12f566f0/delegukiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01cbf179-ff16-437e-b35b-774b7f366fef/para_que_sirve_el_magnesio_400_mg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054a4e9a-be48-42c2-ba0d-f91513a6a27a/kenmore_elite_double_oven_gas_range_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5bf9ff-7951-4787-ba59-04b52b9bdac7/how_much_does_being_a_foster_parent_pay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced7785a-6ae9-420f-81a4-6b365e522f92/how_do_i_boost_my_mobile_signal_at_home.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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 5272 bytes
SHA-256: 2a5a3c490b15e3d5b4f561ab891900b1a62ac1475884e190bc3efffc53eefed4
font_01_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 10820 bytes
SHA-256: bef0bae44bab9e7f719d3206b981ee3a8cda443aae8b95b52618f250aeb18539

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