Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9264ec375fbb5ed…

MALICIOUS

PDF

70.8 KB Created: 2021-03-06 15:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 01cef9b7c7148b655f61a37549d5e0f1 SHA-1: 4938212ff224a305bf66237190cccd4b8e4c48a7 SHA-256: b9264ec375fbb5ed8291e70be350661f90951a700948913c5d251467fafbcd46
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the URLs. The document body, though heavily obfuscated, contains references to book titles, suggesting a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://leonvi.ru/award?keyword=bloodborne+official+artworks+paperback PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413468/normal_5fd265db6ec69.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/literary_devices_in_i_too_sing_america.pdfIn PDF document text
    • http://iuts.space/64118967300wy2o9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_6012e08d3b9a3.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/68536295283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fd0fead6e306.pdfIn PDF document text
    • http://hookup158.fun/pexijuvukebh22pd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5fd12b2a92686.pdfIn PDF document text
    • http://fimewot.xyz/71358171391t5d1l.pdfIn PDF document text
    • http://baby-slings.ru/kovexederegerukiropifaber5y7jg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_5fd7b50f5e624.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rejiner/38234139538.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/86537464225.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_a8a08c4756ae4624b7fa6ee4a7a8ec1e.pdf?index=trueIn PDF document text
    • http://mawivevixovoxet.epizy.com/vidmate_2018_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/pamowufafoxomanusupot.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/zotixekuvexob.pdfIn PDF document text
    • http://ditajizuru.rf.gd/fulalonifedunetajepatiwim.pdfIn PDF document text
    • http://lerezivopo.rf.gd/speaking_english_for_beginners.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_9cecca46adf9451985eec629b2f19de6.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_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 5492 bytes
SHA-256: c725d1ca138d81a54715498e4a6e3b412f0aeb1c328f3f99e53c38ea23d170c4
font_01_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 10084 bytes
SHA-256: 7f988a16e9836e874e1c915cf34887bfb4c6513820d077c855ab87c1f276c626

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