Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a854108c82eba48…

MALICIOUS

PDF

71.4 KB Created: 2021-06-05 18:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 15113f34f70182a92adc0a5da4007ee8 SHA-1: 1becf1e629db24b309a0fbecedca8f5b2672181b SHA-256: 5a854108c82eba48948a0c8a5d007761b50431927c5261882876eb8ac90be92e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing a trojan. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/pbw?utm_term=south+park+phone+destroyer+cheat+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387242/normal_60bb0eba7d089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377125/normal_5fc8c44162632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5fd997bc114db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_6065a73b71d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_6023f273109f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_606ac6bc047c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_602f2639b3cd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374373/normal_5ffd0d6d9cf50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_5fe607ac1a635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_600ddc24e9a3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_5fd30b8f574be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_60625054c68bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417212/normal_5ff8c3f9b076f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_6043bc7ba0055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fe0b0fb3f761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_600e058f675fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://marutipug.pbworks.com/w/file/fetch/144588354/how_to_cut_african_american_toddler_boy_hair.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144508803/can_you_build_biceps_at_home.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144575796/68807970605.pdfIn PDF document text
    • http://memofemovo.pbworks.com/f/cimarosa_oboe_concerto_in_c_minor_sheet_music.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144426549/vevalosinagozisawige.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/what_is_the_job_description_of_a_sales_and_marketing_manager.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/muzuwofububi.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144598419/is_the_dating_game_killer_on_netflix.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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 5396 bytes
SHA-256: bf7425a89341a55ce78ce629de40ec1b846fc4d1f3632f8079946f38a7043448
font_01_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 9480 bytes
SHA-256: 9a170d9ba1592097291d0ca691ce6bb5d5682dad8252ad66afbe5465cf221b4d

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