Malicious PDF — malware analysis report

Static analysis result for SHA-256 16600f21f513c21f…

MALICIOUS

PDF

58.6 KB Created: 2021-02-27 02:34:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3ae7692ecc36a723b7759f3105148b8b SHA-1: 9b13bf9b904b6f0e13eb9c9ab9c65567718a9539 SHA-256: 16600f21f513c21f4291c5761a925c124544aa25f9fca05c7c2f95873762e2da
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded links, with one specifically disguised as "5 star review response examples" leading to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6845

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/aws?utm_term=5+star+review+response+examples In PDF document text
    • http://pl50off.info/vazidoveh8a5c.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/nimurapodevam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428061/normal_5ff192ccda7dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_60225a3b19ddc.pdfIn PDF document text
    • https://lotekovikerux.weebly.com/uploads/1/3/1/3/131398560/3995490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fea369e593f7.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/wopejurew.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/xedot.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/john_deere_750_tractor_for_sale.pdfIn PDF document text
    • http://ketotreno.buzz/renuevame_acordes_y_letraqfgbo.pdfIn PDF document text
    • http://buylettersonline.com/cuanto_es_1_65_metros_en_pies7n261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_602613655925a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412181/normal_6007f033a7bfd.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/40191463549.pdfIn PDF document text
    • http://andyhong.blog/background_check_apps_androidvl4wa.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/72119262536.pdfIn PDF document text

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