Malicious PDF — malware analysis report

Static analysis result for SHA-256 a619aadd906cc80d…

MALICIOUS

PDF

77.4 KB Created: 2021-04-01 19:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c80d938c50a5a75738e137f5ab5722b3 SHA-1: 184bcfa0a4cb036b804ebfeec3ca5884f971bbcb SHA-256: a619aadd906cc80d4fae25e6dbcea66ff6ea0eadd2f642eadae728def9f56657
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 5

  • 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=hamlet+act+2+quizlet+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405652/normal_600e32101604d.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/ifjdgj6/lutebunetilisepari.pdfIn PDF document text
    • http://blankid.ru/51680992369xrc14.pdfIn PDF document text
    • http://ridunculus.com/kugigupuxezu00jgd.pdfIn PDF document text
    • https://cdn.sqhk.co/bitubebo/gjjiRhj/oceanhorn_apk_paid.pdfIn PDF document text
    • http://trycabinets.xyz/dell_latitude_e6430_charging_port4pcnb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_6018b52d1548a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71fc3d66-43b2-4ae0-adc3-dfbcdf8b5360.filesusr.com/ugd/6605a0_88c7043171054a96a8590fed5e2d981a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95a7202-f39b-4db7-9905-d0482101083f/ascii_numbers_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3314667-98d5-4e31-82bb-5f3582bc959a/muvixesaxipozezadek.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_a2658ede18324e6e84212eb062896c22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/533f7c0e-1f4f-47cf-aadf-81efcae1e4ad/51818215920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78325c4-a001-4e84-a374-4d1573db8e79/surface_area_of_prisms_and_pyramids_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c385d0e-b895-4c5f-ac87-e7f10cfe36bc/sobujorapivolufaxukix.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/75929766181.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/wevasuniwono.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/garden_city_telegram_police_reports.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_bf9a58cff56d44a1ad6d88999d2c06b3.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_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 5120 bytes
SHA-256: 6c30e7ea07ffa10f17f77c236441548d233452e1b3d2304d39d64fac2b1f3f44
font_01_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 11460 bytes
SHA-256: 1f1bf101d91cdc502c51dccff0efcadaec1e4fe03e752d2c1e54487c83815ae1

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