Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5315b21f7529988…

MALICIOUS

PDF

79.5 KB Created: 2021-05-08 14:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b5a60d967808c287812888b2ed116737 SHA-1: 1dcdca96573b3a0eea3333474c9ff53e0eb9a7b7 SHA-256: b5315b21f7529988674819598a4058d08dc04600c701e0e39754b8e8ffbc6f71
186 Risk Score

Malware Insights

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

The PDF file was identified 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 a link farm or phishing operation. The embedded URL `https://jumiwimov.ru/strik?utm_term=writing+topics+for+middle+school+students` is a primary indicator of the lure used to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://jumiwimov.ru/strik?utm_term=writing+topics+for+middle+school+students PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464850/normal_5fef5af637fea.pdfIn PDF document text
    • http://neo-tp.ru/unsecured_notes_payable_on_balance_sheet7gu5p.pdfIn PDF document text
    • http://get3creditscores.info/lazy_boy_recliner_repair_footrestzuqeb.pdfIn PDF document text
    • http://mobutadaxez.medianewsonline.com/93908021433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_603d295d10bbc.pdfIn PDF document text
    • http://mapugukabazewu.scienceontheweb.net/test_de_raven_descargar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5ff1dee59e057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_b8d32dc4e0c84f5c9f7e3095b7e1fdf7.pdf?index=trueIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/sofinininuxerixakuka.pdfIn PDF document text
    • https://814bd5e1-0b6f-40f8-b2e9-6ab0015c5eef.filesusr.com/ugd/cc77ff_e49f9a691d4745e68fd20e596bec754e.pdf?index=trueIn PDF document text
    • http://vakifavu.onlinewebshop.net/6397587634.pdfIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_1a161bd92ab246af9be388d38ad524cd.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_bc34f3c2686c40dda350bc413159f215.pdf?index=trueIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/asset_management_value_chain.pdfIn PDF document text
    • https://1e6856c5-1481-42a3-8d1a-2a2567f9fa5a.filesusr.com/ugd/a8b033_e704c2684f9e4950848768507cac18ff.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_5a576686a89541cba5d087299b2414f4.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_fcd9e6c74ed749c9b375e50bb780eb29.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_7975ee5c105b49ec9abc03fe8d27dd0a.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_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 5372 bytes
SHA-256: 41763897d37072d6490437202c8bcfae9b790f48cbee614bd9024053476c2dad
font_01_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 10884 bytes
SHA-256: 849c4896dd03d5223a8776924eff0ce1b56a251e0698b2b1cd208779395e1bae

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