Malicious PDF — malware analysis report

Static analysis result for SHA-256 e526d05f8b06055b…

MALICIOUS

PDF

63.3 KB Created: 2020-11-21 23:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cf0595873b5dd0ca48cd04c63cefb4fd SHA-1: 81bb20ef01573dd70059b651044e5e66d7d30bf2 SHA-256: e526d05f8b06055b9449e1897c02d11303522517547468bfe8c047daca9a2db5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL suggests an attempt to lure the user to a compromised site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://ggtraff.ru/123?utm_term=poem+graphic+organizers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5f924cd15f4eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_5f989f5da2bec.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/8278019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5fa8041fafc98.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/pipepotafepefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f88a789721de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_5fb8b64455dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5f8c29609e3d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/617523cd-d270-4794-acec-76918234b780/37006984175.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/eureka_95b_2_in_1_cordless_vacuum.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/dovopakat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2496246-b967-499e-aa7d-6dd3b629afd0/entisols_soil_type.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_off0000bb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3C 5364 bytes
SHA-256: 906d27c6a6483a0ca2ffa2fa91c6ff174d830667f91cdcd591e9fa2d732b283f
font_01_sfnt_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 10312 bytes
SHA-256: 41c1bf2ae68ef923038e2d0c107698f77efd3437f3471af8bf3955600489bc1d