Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eadf4cfde14e734…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 21:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5d5a5d2d8dac38663d131ac22460c314 SHA-1: 97994ea5a02ed0010b568d310b1e644a6ae343ae SHA-256: 7eadf4cfde14e7343d05627332b5c1677795dc9851443e7658a9d224eb2e3c73
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The embedded URLs, such as the one pointing to a 'printable colored world map', are likely lures to drive traffic to these link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://leonvi.ru/123?utm_term=printable+colored+world+map+countries+labeled PDF link annotation
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/8160969.pdfIn PDF document text
    • https://natuxebifenukud.weebly.com/uploads/1/3/1/3/131378868/7599272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5ffb4e9acf5cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5fc7d516a47e3.pdfIn PDF document text
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/kulul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386354/normal_5ff16f87238bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470228/normal_5ff29f42aa980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_6010936884e08.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/xavabigelif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_5fdb73fad9f3e.pdfIn PDF document text
    • https://xidekudogigut.weebly.com/uploads/1/3/4/6/134683706/fokupisotomef_watade_pimelefesabeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_6038717f24f8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481513/normal_5fee71bf5d214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490123/normal_6036550aef66a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5fda9770b2dc1.pdfIn PDF document text
    • http://kuzojud.66ghz.com/unqualified_audit_report_malaysia.pdfIn PDF document text
    • http://xugerovogubex.22web.org/estandares_y_expectativas_de_ingles_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_6035cab87adee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafazexetoraxik.epizy.com/waking_life_full_movie_720p.pdfIn PDF document text
    • http://ratebasazor.epizy.com/emmy_predictions_hollywood_reporter.pdfIn PDF document text
    • http://sajonagot.rf.gd/casualty_loss_form.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_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 5452 bytes
SHA-256: d504c4083925ab6c53c2719c9c114c308f8ae6a8e40910e4af800cf677acd251
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 10528 bytes
SHA-256: 3726c4a1c46c918595504112fb610458f6b1da487822f48f13e531e195974d0a

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