Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d4ea5931976b2b…

MALICIOUS

PDF

77.1 KB Created: 2021-04-16 08:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9e4de17cf742c30d518607fd620dc20b SHA-1: 8348211081c95b6a81e5084f097a4427a8aa6347 SHA-256: 62d4ea5931976b2bfdc74cd1bff4fdc5d06e843700bf58cdc5bf6c4a3daf1cd6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://fokemale.ru/strik?utm_term=how+do+you+reset+the+filter+on+a+luxpro+thermostat PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423772/normal_601d17d5f249d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_6011051f841dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_6014d7b4bbc8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445338/normal_604ac3656833e.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/dd_wrt_router_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_606a09e851d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_604d3974d1c88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_600d615b1c474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_603912eacef3e.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/myer_briggs_personality_types_definitions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_603a13ca15bac.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/tipikaxe/collocations_worksheets_advanced.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/dyson_big_ball_animal_2_spare_parts.pdfIn PDF document text
    • http://zisibife.epizy.com/36286406736.pdfIn PDF document text
    • http://kubowulurarekij.myartsonline.com/how_much_cream_and_sugar_in_dunkin_donuts_iced_coffee.pdfIn PDF document text
    • http://jezirateba.rf.gd/31531133870.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_4f11d67bfd1f4fe78d2a6d6745e30733.pdf?index=trueIn PDF document text
    • http://faxevimisosideg.myartsonline.com/2112671236.pdfIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_d19e288da53949b8a2d303c5583d1a3a.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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 5504 bytes
SHA-256: 0c2fcea4b9639a552a5239f258f7d0659d764d9c5f994f4bee16dc6ab6e15de8
font_01_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 11144 bytes
SHA-256: 22e79ba0872c7253d237b2e5596a02071a2585d07fced420758c6acb61ce669c

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