Malicious PDF — malware analysis report

Static analysis result for SHA-256 87705592bd0c67c7…

MALICIOUS

PDF

72.3 KB Created: 2021-01-20 08:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 14c5c8b4d4e53c930e4ab8aa678d08e1 SHA-1: 8e9a1552637bca6b1c96d84c8b1ab20f708b58a4 SHA-256: 87705592bd0c67c7e6917107fa584d9503361c686fb6b171a44d9ed24dfede8a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'seumenha.ru', suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable hosting. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

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://seumenha.ru/123?utm_term=how+many+oz+is+a+pint+of+sour+cream PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5fe513f04ccb7.pdfIn PDF document text
    • https://xuzulofapoxe.weebly.com/uploads/1/3/5/3/135325887/vovazazakew-radatijagov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485570/normal_5fc4b5755cdf3.pdfIn PDF document text
    • https://fusidaxeda.weebly.com/uploads/1/3/1/4/131453850/1582327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447086/normal_5faf41bc39d6e.pdfIn PDF document text
    • https://site-1198644.mozfiles.com/files/1198644/76285855059.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/ludevovoduvibosadipejur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fawivemepogu.epizy.com/arati_mukhopadhyay_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/function_decomposition_worksheet.pdfIn PDF document text
    • http://surofavuvaxono.epizy.com/2063879149.pdfIn PDF document text
    • http://dogurof.epizy.com/33023273848.pdfIn PDF document text
    • http://kagiwabiluwotel.epizy.com/azhar_english_speaking_course.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/howrah_bridge_1958_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/pofidabozezobata.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_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 5336 bytes
SHA-256: 578af768e6a2a7a9c2952999b4be764d87d2eecfdbf217c6d1d2127335f53730
font_01_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 10828 bytes
SHA-256: 8ba2c28c16e851bca7afec17577d920ffd8e69ff8b7b0d47f331582662f8c853

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