Malicious PDF — malware analysis report

Static analysis result for SHA-256 4201154df87d4e1b…

MALICIOUS

PDF

77.4 KB Created: 2021-04-07 09:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06c5fb9c715debcee01064ccda9a6130 SHA-1: 8e8d76cc9ed9bfc6e7b4339fbfa68a1e32b83344 SHA-256: 4201154df87d4e1bfe1724a578c551691fa997355ea16927718961d0164ba925
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the structure and numerous external links are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://domotoj.sportsontheweb.net/physiology_book_ak_jain_download.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_60675723bccf0.pdfIn PDF document text
    • http://becloud.website/64683477891gzqc2.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/modo_de_produccion_asiatico_caracteristicas_sociales.pdfIn PDF document text
    • http://lapiwudoxavov.scienceontheweb.net/angrau_study_material_entomology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_60258f8d60191.pdfIn PDF document text
    • http://characduwe.space/cpt_book_2020muzle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_602b0519ddfda.pdfIn PDF document text
    • http://pixell.store/milowelevanujegovifenk9zcs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475397/normal_6024ad7517e5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/4NO0L8wlyOA/wb?keyword=que%20se%20puede%20utilizar%20como%20filtro%20de%20mascarillaPDF link annotation
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_f8ffafa4a569443188480daab3ebba0a.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_ac6bce564b7c40c887bb7f914e5c532d.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_108f245b911c4fa0baee47244540f3dd.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_38661d2d92a04629b6dc26340f1867e8.pdf?index=trueIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_8689e29af7da4c03b71a80c3cd8ec522.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_48034e489554405e828994b3935496fc.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_a8cc9733c3124a18ab6aea0d3e7ae4ec.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_8d5b47102e2c4a1da771fef20e65fe7d.pdf?index=trueIn PDF document text
    • http://tatesit.myartsonline.com/pdf_split_pages_ubuntu.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_0060a72c4fff42fd8a10fbc2cc5cb771.pdf?index=trueIn PDF document text
    • https://c039f79f-855f-4b64-8838-30138aeea086.filesusr.com/ugd/6b78cb_39b888d785ee42d2953abf4d9811c0ed.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_76142475f52e4f6292224920d58207eb.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_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 5412 bytes
SHA-256: dc01966d7f80e93f4c596113549b5ce91c3a2fe35d4be61e1458f28cda1ccb3c
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 11852 bytes
SHA-256: 1157cca286db3cc820187442fda19de139b4b946318d63975802c98eee7086ba

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