Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33c3ae13260554e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 06:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 54db97146bbdd9566af6f9f5718d6b64 SHA-1: 2d12031afca6a251f851f4aa11bf146403527574 SHA-256: c33c3ae13260554ec7400a040b76640a7b2907ad3e2c367f80879cb878c56257
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 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/award?keyword=problem+solving+techniques+in+project+management+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495391/normal_60305b9bb122b.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/hp_laserjet_p4015x_printer.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/california_common_core_standards_ela_grade_3.pdfIn PDF document text
    • https://gupolapi.weebly.com/uploads/1/3/4/6/134629895/mepugosopifexeve.pdfIn PDF document text
    • https://natozimokuwepef.weebly.com/uploads/1/3/4/3/134398015/zatipedoki_ruriwa_numijerof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_6007d877302cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_6028678ca074f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474470/normal_5fcd17e716345.pdfIn PDF document text
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/e6206764f482c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_6049dba09c992.pdfIn PDF document text
    • https://terifebi.weebly.com/uploads/1/3/2/8/132815785/ad0230f38cfef1.pdfIn PDF document text
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/sozirawejoboruf_kasaw.pdfIn PDF document text
    • http://lutirojibafap.sportsontheweb.net/criminal_law_consolidation_act_1935_sa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawewil.atwebpages.com/deskripsi_batuan_andesit.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_ce073f8c747a4eaa8fe937cfc044300a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c4edae-8c67-4252-b39a-0ea4a07d32d8/precision_bolt_action_rifle_parts.pdfIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_bd8df15dae8a4297aa18f08b85c8f5c7.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_cc7c23be20ab45689b28a48887cc5940.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a77f53-cac9-4516-9bb7-76a46ed6f37b/estudios_biblicos_adventistas_la_fe_de_jesus.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_d0c34066094546c5b48e9e355ee95ebb.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_5f125f0988ae4d7788231cec6fa0ea19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90d505b5-3012-4f77-9e00-3f1e8c3ad72f/86775694630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8e882e-7ed3-45b1-a2fc-0ae41d13cfbd/bivata.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/safokiturerozobewekine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f337bbd-62f5-4190-90de-687470c1bf31/use_the_4-7-8_breathing_method.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_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 5972 bytes
SHA-256: 47079296b37fd51c16a3042321bf726089c7bbbc48c881e9de5f0218ffbb412e
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 12364 bytes
SHA-256: 7b99bf0b549afcf04694928f3cc556033ddd94e6db1741801b62afe0d724aa65