Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18af807b5b3526d…

MALICIOUS

PDF

79.2 KB Created: 2021-02-27 10:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a6368a8a03f89c27dfd9fa8ac5dc5a1a SHA-1: 7724f4d5c9aa59914989c816f0bd9371612c1c73 SHA-256: d18af807b5b3526d7d98aaee818b7756db82f30e8c6371b5830a942a443a350e
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to "The Crown" to entice users to click the malicious link. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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
  • 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.
  • 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://dafemum.ru/123?utm_term=the+crown+season+2+episode+6+review In PDF document text
    • https://static.s123-cdn-static.com/uploads/4460231/normal_5ff6ae6536a6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490519/normal_5fe46cfc22396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_6032e71eb8101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452171/normal_60371664d05c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377109/normal_600013ec4c646.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/bike_rider_images.pdfIn PDF document text
    • http://rubeatyshop.xyz/pafeno9y00c.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/nazekisigiduz/29698569924.pdfIn PDF document text
    • http://monulaw.epizy.com/33871335353.pdfIn PDF document text
    • http://texazufuvo.rf.gd/tadenope.pdfIn PDF document text
    • http://kosepeb.rf.gd/film_lookbook_software.pdfIn PDF document text
    • http://xugomoxuniwemo.rf.gd/google_play_store_update_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/99397046445.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_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 5516 bytes
SHA-256: 93b56e2e0750766fbce17663023687e49ad64854f66d6533b8b9ab8dd59cf199
font_01_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 10448 bytes
SHA-256: b4c3b8642d163e477973d92c99152f25821ad3db258a436081a7aba35d3a5939

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