Malicious PDF — malware analysis report

Static analysis result for SHA-256 d158210a0a4404f7…

MALICIOUS

PDF

70.4 KB Created: 2021-03-20 03:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: af3f39f797fc2a101e73a1bdfcf0d94b SHA-1: 681566fc6eaecdaa2f1069d97afa72031e74addd SHA-256: d158210a0a4404f790ff80c3c6370d653d750a02ca28ab7a12fa2b27f52a1d25
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a malicious link farm, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. It contains numerous external links, with one prominent URL being https://mezovuduw.ru/strik?utm_term=kobalt+miter+saw+replacement+parts. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=kobalt+miter+saw+replacement+parts PDF link annotation
    • http://ibkreactiva2020.com/pc_games_download_free_listnrvh4.pdfIn PDF document text
    • https://junerokiwoji.weebly.com/uploads/1/3/0/7/130775834/zebepuwovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_601ae9a91a2f3.pdfIn PDF document text
    • http://hempmap.ru/95681757415isg75.pdfIn PDF document text
    • https://jupifezugaj.weebly.com/uploads/1/3/0/7/130739886/mularaje.pdfIn PDF document text
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/falaravasilipu-dowasamavosu.pdfIn PDF document text
    • http://hargotel.xyz/position_velocity_acceleration_graphs_worksheet_answers6azwr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_602de86a17bbf.pdfIn PDF document text
    • https://lakiliwurig.weebly.com/uploads/1/3/6/0/136089988/kazame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxukakex.rf.gd/rejawavakomimanozopebiden.pdfIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_b4ce950717144a9dadf95f0101add4f3.pdf?index=trueIn PDF document text
    • http://demuremapinob.epizy.com/imagen_de_caritas_felices_animadas.pdfIn PDF document text
    • http://xijuwevame.epizy.com/mupuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7cd4a2f-a6c7-45dd-958b-dd570bba383f/xasivivorilodikudexesuwe.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_84dfe81c3b2b4d79a4efccb7744ed07d.pdf?index=trueIn PDF document text
    • http://xipotuwutupi.rf.gd/aruvam_tamil_movie_tamilyogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e2bd24-fd92-4631-a69d-64d4fcb3d32b/direwat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b56b8b-67b5-41e7-803e-9b55f0ada5c1/35646809610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300c6720-f189-4ff4-90e8-f952bac8e8cd/34653362145.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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 5280 bytes
SHA-256: 7c90106d3b23d816bbb062b5da904f59678d3b816cd61765f9b0f7fbce2ca02e
font_01_sfnt_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 10468 bytes
SHA-256: 2505cf62780375bcaea16440a320438876c2be61e6898c68c37c34cb12b36a4a

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