Malicious PDF — malware analysis report

Static analysis result for SHA-256 583ee00206fceb6c…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 14:13:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 874b6285b78e636df8254ed9b5810ba8 SHA-1: b130432bac23d7286742799314ddad2275bda54b SHA-256: 583ee00206fceb6c2cc9cb44faa88e5368e15a8bad8e18f8d1a489ad41fcc89f
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, exhibiting characteristics of a phishing and link farm attack. It contains numerous external links, including one pointing to 'dugedepap.ru', suggesting an attempt to redirect users to malicious sites under the guise of providing a utility. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/wix?keyword=avi+video+converter+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366676/normal_600c6fc167c4b.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/fZiirgz/streamlabs_overlay_maker_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_6011f08267233.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/jdjigdf/utility_theory_and_insurance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_600f65716a9f7.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/english_to_english_to_telugu_dictionary_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f61044b-ede0-4564-a309-75914a409daf/25630534894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f50ba109-d2d3-49ee-b7b7-bddf8c51d42a/dark_souls_bosses_rated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9d888e-4f4d-4fb8-85c1-fd6e07272067/chicco_keyfit_30_weight_without_base.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_b381ba5ec1b64ca8b427c0f417d22463.pdf?index=trueIn PDF document text
    • http://gupatevefojip.myartsonline.com/74797361871.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_ceee43f5bce64c318ef74d9646ccdf61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1190055d-9741-46e2-9566-1566c41196d1/dsc_1616_quick_reference_guide.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_c9b4030996914413b493cddca6cb1c35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d2ebe0-4b47-4667-9e94-13def02e8365/how_to_bend_1_2_inch_offset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8e82e2-c4ea-4e95-a4d2-8abb92579e38/zabefofabefenobovojil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a6ac39-d742-4a6e-a571-097ddadbee8d/47712962793.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_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 4780 bytes
SHA-256: 62ae72ef295e9f01900b2c6657d295438b6594ac4c35940073b3bb87445183d1
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 10784 bytes
SHA-256: 9302be74e45b6d8356171b23f8e9972973c8b0b9678fafb90d8b6aa07627e4ef

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