Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8ea72ab22719b4…

MALICIOUS

PDF

77.4 KB Created: 2021-04-03 13:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 61f0e26a8ebf99afa6cd8070c73d0f40 SHA-1: 733100fde7927f2f7ba4ea8bd5aa057d1d573549 SHA-256: 2c8ea72ab22719b47b7029d9a4fbc57217ebdf126a261fe7c7dc1407e2f95561
186 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 0.9993

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://botokaw.ru/strik?utm_term=bow+tie+cinemas+movie+schedule PDF link annotation
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/25b13470.pdfIn PDF document text
    • http://modernstyle.pro/39840239514srf6j.pdfIn PDF document text
    • https://rabiwibunefa.weebly.com/uploads/1/3/4/7/134747284/4363829.pdfIn PDF document text
    • https://xakediripikevul.weebly.com/uploads/1/3/4/3/134338645/tiduwefekun_nedumobemelu_ruvilonofe.pdfIn PDF document text
    • https://nirafagasebop.weebly.com/uploads/1/3/4/5/134588809/widodajifinokok.pdfIn PDF document text
    • https://sojuseruk.weebly.com/uploads/1/3/4/3/134367588/pomoduwixomagis.pdfIn PDF document text
    • http://aycotoro7.xyz/employee_appraisal_forms_freeeoxo2.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/2456fd53-49b8-4de3-ba9a-01cec73f10b1/how_to_fix_samsung_plasma_tv_no_power.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_6080536ef86b46ad9b216b1f7f312d3d.pdf?index=trueIn PDF document text
    • https://bee08bb6-d8c1-4cc5-89f0-d6ac88a4f64a.filesusr.com/ugd/8b8a1f_0ab4c7ad213242559ff22778619bd952.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3faed42-d996-4bd6-b587-970a2ec2eef9/does_medicare_cover_preventive_services.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_d89b0824bc994ddfb0d2cb549e647380.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_67ec3a126c8542d89ac412ba0777d773.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6bea6e1-5294-4f71-841a-4d93997d4648/48161946753.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/tecnicas_e_instrumentos_para_la_recoleccion_de_datos_estadisticos.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/75422334406.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_3d509c8f2d8b4153b266eee42076684c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3953d6-8b43-463b-8640-7d5eb91817bf/forrest_mims_555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8671f35b-195a-4218-b89d-255b1e625b74/15110691931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08e7c71-ef78-4144-8b64-61e68deafbdd/folimutugupoguku.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/beckman_coulter_access_2_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4598abc3-f05b-41c3-b816-144e1bc5d478/how_to_fix_a_maytag_washer_that_wont_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05153473-74f5-4ee1-87a6-82a0fabe10ae/78471600463.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_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 5284 bytes
SHA-256: d70a0c133c6bf730c22e5575ff4e25301f334014a8f4c635e4a1bf8c85c6cde1
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 11404 bytes
SHA-256: e14569dfa37744ce08c9a2f0eff579d15f0419d752df729de7557cf1cdce5bcf