Malicious PDF — malware analysis report

Static analysis result for SHA-256 87025f097a818c89…

MALICIOUS

PDF

93.5 KB Created: 2021-02-21 07:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 25e76b15b6217e2ef035d09a26ed91a4 SHA-1: 2b67602d85a5bf372d49465f581ec713c9aaba1d SHA-256: 87025f097a818c89a593df8f4a1503ea2191632d35384ff4931df78bf68d4f48
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a URL associated with a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to an attempt to drive traffic to potentially harmful sites.

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://maypoin.ru/wb?keyword=what%20are%20the%20things%20needed%20for%20photosynthesis%20to%20occur PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375509/normal_5fd84fb59c3f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471249/normal_5ff54699b5636.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370071/normal_5fc61d5448e41.pdfIn PDF document text
    • http://7evenrp.ru/fujifilm_finepix_s1800_priceqbuuw.pdfIn PDF document text
    • http://tofuvuniz.iblogger.org/como_transferir_backup_do_android_para_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_600ffe62d1584.pdfIn PDF document text
    • https://dovasivenumi.weebly.com/uploads/1/3/5/9/135965427/7839819.pdfIn PDF document text
    • https://karesaxu.weebly.com/uploads/1/3/5/3/135392924/5083695.pdfIn PDF document text
    • http://khanapoorti.com/calamity_mod_slime_god_guide6v0a0.pdfIn PDF document text
    • https://gojupisot.weebly.com/uploads/1/3/4/0/134016698/8992520.pdfIn PDF document text
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/vapozox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuguwobafadurot.rf.gd/ccna_security_certification_guide.pdfIn PDF document text
    • http://ridabus.epizy.com/kusibumidonenagox.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/89727641192.pdfIn PDF document text
    • http://kodosalepixalan.epizy.com/wisowomizatijol.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/create_a_google_sheets_template.pdfIn PDF document text
    • http://xakitidopapav.epizy.com/reconstruction_amendments.pdfIn PDF document text
    • http://vimodamugirad.rf.gd/76250375818.pdfIn PDF document text
    • http://zaruxokogidut.epizy.com/real_madrid_vs_liverpool_legends_team_sheet.pdfIn PDF document text
    • http://voxinuxo.epizy.com/vumelig.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_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 5500 bytes
SHA-256: b309e216ff9f29a27abab165e178f4dd76ae5b0136dd3ac7ba0590eec8eef081
font_01_sfnt_off0001418e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418E 11268 bytes
SHA-256: d189e1055c3345238a9f50d6f9865deec35cdc538e7cdb719b97778eecea6fa4

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