Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e65db4c2865fe5…

MALICIOUS

PDF

114.7 KB Created: 2021-03-23 16:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b86829cc8bdaec26341f65e98abb6122 SHA-1: e11f3650c9f30801b18cedbd5f856912f5fa1754 SHA-256: e4e65db4c2865fe5fc1ecf86eb35f088d2fc4fdb5dec8580b72e89cd67f3a8f4
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, characteristic of a link farm designed to redirect users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to lure users to external resources.

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://druttle.ru/123?utm_term=castilla+la+vieja+dionisio+ridruejo+pdf PDF link annotation
    • http://repair-telefonov.ru/the_ordinary_skincare_guide_for_combination_skinsxeez.pdfIn PDF document text
    • https://nunokewapi.weebly.com/uploads/1/3/5/9/135961733/bb0c7dc.pdfIn PDF document text
    • http://italywom.space/79085182883en0gi.pdfIn PDF document text
    • https://ditaziretuviki.weebly.com/uploads/1/3/0/8/130874055/8047570.pdfIn PDF document text
    • http://zavodtriumf.com/romeo_and_juliet_balcony_scene_analysis_worksheet6p94e.pdfIn PDF document text
    • https://toposizijud.weebly.com/uploads/1/3/0/7/130776562/6225371.pdfIn PDF document text
    • http://ledy66.net/amazing_grace_classical_guitarfc7nw.pdfIn PDF document text
    • https://wuxavuzipirugud.weebly.com/uploads/1/3/4/0/134012349/posateranox-pasib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_0628eec4740443b986d108b98ead68d2.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_79ec1465fc4946d2988b988396f01b3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satuja/varodomokipogawirex.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_14e0fb2e4776418ebca11b0c5fac3ce6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wavunot/30915217560.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/cash_flow_projection_spreadsheet_template.pdfIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_dfcba71b8df3482ca97b38d5efe65a99.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_376d06b2bfff4acd8cf4d05ef7a86411.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_e3aa9acc8dfd40b89009544d35259eab.pdf?index=trueIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_a74a571007834c6eae21c4849cacb35b.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_0732868550c44185a588b28d2b2d68c5.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_cfba425dfcd548f3ae61555a5eaf6883.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_off000183a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183A6 5076 bytes
SHA-256: 0a01583e4a2177470c1ddd97fba5f8df6c428249833465198a44374792072d72
font_01_sfnt_off00019500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19500 11936 bytes
SHA-256: 8c4b285b10cc2d94cbaddb7bfc7c23fb9410a9b04bb7b82e090dea38f204f596

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