Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f3c9e438a8752b…

MALICIOUS

PDF

77.1 KB Created: 2021-04-06 13:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 12793ab93be700f9cc1324a086779269 SHA-1: 12f95ac9763f15efd48097435617bd38912f698e SHA-256: c0f3c9e438a8752b43eb972cb5207c23eb516c14ab18f8a1be8c2cb8e4fe4e92
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 0.9992

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://xajibur.ru/strik?utm_term=top+geotechnical+engineering+companies+in+uk PDF link annotation
    • https://fixemebipufuw.weebly.com/uploads/1/3/4/1/134131586/36b57719fde9.pdfIn PDF document text
    • http://polixomun.22web.org/vujosirizepetojizoxanop.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/XRzJGYc/switch_controller_pro_connect.pdfIn PDF document text
    • http://janexik.22web.org/sibum.pdfIn PDF document text
    • https://cdn.sqhk.co/sonawumi/XidggEH/maxofomu.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/fjhabhh/android_tv_box_for_sale.pdfIn PDF document text
    • https://nubajegi.weebly.com/uploads/1/3/0/8/130814178/xaweguxozadisibu.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/lenuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/ORijphc/cake_recipes_with_strawberries_and_pineapple.pdfIn PDF document text
    • https://cdn.sqhk.co/topazawu/hphd6ge/square_tubing_rocket_stove_plans.pdfIn PDF document text
    • https://gigadejelurare.weebly.com/uploads/1/3/0/8/130874533/4637164.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/aEtofgf/73783725154.pdfIn PDF document text
    • https://cdn.sqhk.co/rowemarul/gemNdhi/jafax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/podubusozuwabik.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/shoprite_catalogue.pdfIn PDF document text
    • http://xidomuxi.rf.gd/arduino_tutorial_beginners.pdfIn PDF document text
    • http://rolaxaja.rf.gd/biwob.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/77339491605.pdfIn PDF document text
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_d1742ffdeb354b638aee3c678f2ea471.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_2d6aafb4801b405c9c8fa4e5750b2ae0.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_af861f31a9a3478981f2f51cf11f5611.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widiku/53514101370.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/butyl_rubber_gasket_sheet.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_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 5360 bytes
SHA-256: efe67ef4fa6a8857854febdc7a637923a5ab5452b7951f7355cc7e932f07c3fc
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 11060 bytes
SHA-256: 63dad192bd062753c5db1952d89a352f79db9ddf8aed49945b893549f824bd57

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