Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6684416e9abeb45…

MALICIOUS

PDF

130.9 KB Created: 2021-03-18 04:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8986db4ff4e803839181966b3faff188 SHA-1: 5864993eed6bd05c2822a758a180b791eb44b557 SHA-256: b6684416e9abeb4590a6afbfd71ad07a1c63e7f9c6d0a94c347aafdd3627dee3
186 Risk Score

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 0.9958

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/strik?utm_term=how+to+put+mendeley+in+ms+word PDF link annotation
    • http://ribavid.medianewsonline.com/sagavegetur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_602018bd5672c.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/hdjhQjd/farm_jobs_near_me_no_experience.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/TNibheV/square_hanging_bird_cage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_60111807b75c4.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/95644525104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449974/normal_603a2a3d850f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_5ff5f90acee3f.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/patupemiritezodotib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426571/normal_6041abd10598e.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/igSKIhe/the_gardens_between_switch_walkthrough.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485001/normal_5ffd648dba08e.pdfIn PDF document text
    • https://cdn.sqhk.co/jorisuzil/jgEuA1w/6963020609.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/wjcUha9/aafes_wright-_patterson_military_clothing_sales_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_600a6bc541346.pdfIn PDF document text
    • http://neo-tp.ru/1877948540987q7y.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/kingdom_hearts_1.5_after_agrabah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_602e3c8a0682c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_60134dde4155a.pdfIn PDF document text
    • http://erogan-columbia.site/65370280530i56bg.pdfIn PDF document text
    • http://1xbet-regi.site/tevowemowowisbtj69.pdfIn PDF document text
    • http://duwosolutanuz.mypressonline.com/bodedokuzep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_e3188fce564a488bbb213b980fa7aa04.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_daf4a8c8b08447ef8b770986c60d8640.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_930db41a81154565ad436b53bdbc1ec9.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_0b351b88877d4771a80d240a793576b9.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_551dd8466f8c47d88b2b5ad81583a774.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 71408 bytes
SHA-256: 21f06e21f3041b642059c7a181d4a96cf6a86a9978aba7e1faaaeef562bd50db
font_01_sfnt_off0001c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7E2 5052 bytes
SHA-256: 54740df638955984f85e7694d4b3ca65f7f168a894cb58cfd3dc616d580606c1
font_02_sfnt_off0001d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D90D 10592 bytes
SHA-256: 40c85d32b62d5cfb7b0fc710bcb4bde7e2e055ab36cf0f20c21e7ce2c056634a