Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a68ac5ec13d1f1…

MALICIOUS

PDF

81.5 KB Created: 2021-04-05 11:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e1e11b16974d25d179c0b534f0c93ba1 SHA-1: 8568c9302a75f891f1a5b78c6e4df78ba394f99f SHA-256: 15a68ac5ec13d1f1518bda27bcff0be0708a478f66bf18c8284902262ffebb08
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 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 0.9997

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://dafemum.ru/123?utm_term=accident+investigation+and+reporting+program+template PDF link annotation
    • http://kimisorunutom.medianewsonline.com/brviaire_d_alaric.pdfIn PDF document text
    • https://keroxoxelesiz.weebly.com/uploads/1/3/1/4/131452869/zipafasare.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/theory_of_biogenesis.pdfIn PDF document text
    • http://gavokofubafixi.getenjoyment.net/68181017271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475562/normal_604d312ed10da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496146/normal_60369f9e376ac.pdfIn PDF document text
    • https://xiwaxodo.weebly.com/uploads/1/3/4/3/134319271/655acfa9b2c1.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/7e284b4c58631c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5fe7e20773e10.pdfIn PDF document text
    • https://sujuxeneme.weebly.com/uploads/1/3/1/3/131380470/gamowa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sekuwomexapa.myartsonline.com/hobart_meat_slicer_model_1612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e127114-713d-4967-80fc-5a0f0f27da4f/how_much_is_nj_transit_bus_tickets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbf0c00-40e6-498e-819a-449adde92a17/10198310595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bcf98a-2a48-48e1-9cc7-80121f24048f/how_to_reset_2015_honda_accord_maintenance_light.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/bizolibotafadazorotipoku.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/tepewuniki.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/rewubimoba.pdfIn PDF document text
    • http://niselasot.atwebpages.com/chelsea_fixtures_2020_19.pdfIn PDF document text
    • http://gototura.myartsonline.com/ejemplo_de_acta_constitutiva_de_una_sociedad_cooperativa_mexicana.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/super_teacher_worksheets_geometry_answer_key.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_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 5444 bytes
SHA-256: 1d27cb855224a33726a576d68e26e1729917d5e6de84938f9bc5ad5e2d4f2b8c
font_01_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 10844 bytes
SHA-256: 730ada98aac5b611d03d433640770b1143ea84ef21d5cd87ad7911746100ce76

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