Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae506ecb4b1f3d6f…

MALICIOUS

PDF

76.6 KB Created: 2021-06-02 19:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: af0c1c9b6f9c07dea4536f187523c8db SHA-1: 8ea9ed17b1cbbe1bfd1f46769b6241b3d035961f SHA-256: ae506ecb4b1f3d6f6d15ad92f08bc1a6e0187cff438b562774e6222ba2de1caa
126 Risk Score

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 0.9998

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://pixomot.ru/pbw?utm_term=how+to+turn+off+google+play+services+keeps+stopping PDF link annotation
    • https://jurugifako.weebly.com/uploads/1/3/4/8/134869201/jurevopafukolud-teguxifuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_605c16982c70f.pdfIn PDF document text
    • https://vijativu.weebly.com/uploads/1/3/4/5/134597759/nujetowizidor_pomiwib_zarituxuwagigag.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/kezijafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_603defab984b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_601601f1b4030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_606e5abf7c251.pdfIn PDF document text
    • https://jiranunurojowoz.weebly.com/uploads/1/3/1/8/131860868/tuzadaw_siwojokewagoxaj.pdfIn PDF document text
    • https://tudasuli.weebly.com/uploads/1/3/4/4/134403402/9427505.pdfIn PDF document text
    • https://xejoxobufedad.weebly.com/uploads/1/3/3/9/133997298/dezilirivuw.pdfIn PDF document text
    • https://zadumujiz.weebly.com/uploads/1/3/4/6/134626950/c8516e09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144422763/vojir.pdfIn PDF document text
    • http://fagimox.pbworks.com/w/file/fetch/144496932/voweramifimubukutuju.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/76472974343.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/safestay_2211a_installation_guide.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/recrystallization_of_aspirin_lab_report.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/ventajas_y_desventajas_de_un_sistema_de_costos_por_procesos.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144449757/que_paso_ayer_2_banda_sonora.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_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 5464 bytes
SHA-256: 39da698d2e1b2cc2e4d6110a5396ec0984f6bf8e5f8d3d3a5299be32fe7b7c66
font_01_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 10836 bytes
SHA-256: a2201e43916d2c9268d297fea374e663da13143ab5a7d29405c1288a5be7471c