Malicious PDF — malware analysis report

Static analysis result for SHA-256 c828d7516fc0c125…

MALICIOUS

PDF

76.9 KB Created: 2021-04-07 14:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cc1eac7c5ae3c684507ef844c9f64ded SHA-1: c7b141a3f473811209d177b6002ad94d3e8459ea SHA-256: c828d7516fc0c125375f575071e429c88fa57e3d93575b62c6caaaf734417ef6
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=new+group+dance+craze PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458150/normal_5fdf392aa8d6a.pdfIn PDF document text
    • http://pumba.fun/suzepunaxemivuredetotunk891p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_602ee2404d9af.pdfIn PDF document text
    • http://xazonojader.mywebcommunity.org/jamawopovovibodisalub.pdfIn PDF document text
    • https://gikuxowatevu.weebly.com/uploads/1/3/2/6/132681634/4896641.pdfIn PDF document text
    • http://myfirstsite.xyz/gidoguwedifutabomijedu2wy5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_6069e59b9b8e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_605df9792f9cd.pdfIn PDF document text
    • http://mynasert.online/navy_blue_mens_trench_coatxfmzr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_60228a3015be8.pdfIn PDF document text
    • https://movefaka.weebly.com/uploads/1/3/5/3/135304133/2502288.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/9443455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugerubuvugox.myartsonline.com/91475926138.pdfIn PDF document text
    • http://lelikerakovet.atwebpages.com/32163743816.pdfIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_4f2815c0e87d4ae69233ff4d0f4a1164.pdf?index=trueIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_2d6ed8fc4a394dd29dc18d4d755242ce.pdf?index=trueIn PDF document text
    • http://sukokovevaz.atwebpages.com/what_are_the_basic_tools_for_woodworking.pdfIn PDF document text
    • http://zijedan.atwebpages.com/digixejemoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838bd1a7-18d5-4fbc-995c-e33dfe0daf1c/34227668433.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_5007d125edae46a2a8b58c87bec100d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab30467-48d8-4af5-a495-3015fde2b5e2/patti_labelle_over_the_rainbow_mac_and_cheese_oprah.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_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 5144 bytes
SHA-256: 99d0506c8906d34769fc4400d6e0e40a4db07344f15c067bb8fa394e3871ee2d
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 11940 bytes
SHA-256: fe694abc3100d9bcd65c522d058119059b16b446589b9acb1610f279351e2136

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