Malicious PDF — malware analysis report

Static analysis result for SHA-256 9236923b8c4104fb…

MALICIOUS

PDF

62.7 KB Created: 2021-02-25 21:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9c3fa32a05f99d7642252359e427f48d SHA-1: 0cdbeaaeb63407b16d47cf8d701a32296b920aec SHA-256: 9236923b8c4104fb3b8c67da0d9f9d2b32155c48328ab1c4d8b516de0e816f3e
182 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or scam attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9082

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/award?keyword=is+long+john+silver%2527s+fish+bad+for+you In PDF document text
    • https://static.s123-cdn-static.com/uploads/4393486/normal_5fdd106b0e1d7.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/giiavKQ/gaming_wallpapers_for_laptop_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_601cbaa82e224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425908/normal_6018689d2d9e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478141/normal_5fed4920067a3.pdfIn PDF document text
    • http://boost-store.net/484261661900l1yu.pdfIn PDF document text
    • http://rankingcoach-apps.com/acls_written_test_answers_2016p0i5x.pdfIn PDF document text
    • http://design-kvartira.info/48769133643o8ozw.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/c73c2877a49163.pdfIn PDF document text
    • http://ketotreno.buzz/como_hacer_hoja_de_vida_ejemplos71cpy.pdfIn PDF document text
    • https://sebinegovana.weebly.com/uploads/1/3/4/0/134095930/zuwokasufom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_5fdba0f3e3503.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/pobixedele/supokimawamifimomow.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/16861074871.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/complex_number_polar_to_rectangular_form_calculator.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 5516 bytes
SHA-256: 24c33c652c0bcca8347593972f193563a551ee99fb82475285369d4db9ac489d