Malicious PDF — malware analysis report

Static analysis result for SHA-256 b964575bc5a511af…

MALICIOUS

PDF

75.5 KB Created: 2021-03-02 02:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d1257033e7a5de55b3dacec5a80efd54 SHA-1: 35625abf4f8c1b19b7ae5eb2641369c9a39a1956 SHA-256: b964575bc5a511affc1da232a80de219c69daded5aa3e2434e541e93a604842e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. This URL is likely intended to lead the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to 'Dmx 512 controller' and 'wkhtmltopdf', suggesting a lure document. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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=dmx+512+controller In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_601c6b168c095.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488349/normal_6005f7668510a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_60144c1f02741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411498/normal_5ffb5206d9d94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465149/normal_5feb5f032a51d.pdfIn PDF document text
    • https://cdn.sqhk.co/dorodidur/hhsgfgh/craft_master_grand_glass.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/gxoRNZf/amazon_prime_video_pin_not_working.pdfIn PDF document text
    • https://github.com/vanvught/rpidmx512In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/23395075321.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/languidece_que_se_significa.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/jededaronuf.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_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 4932 bytes
SHA-256: 91d33d840ea86f19dd065857a4c121c655d9a8f44f805d247eb7e0bfd3bda05d
font_01_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 10396 bytes
SHA-256: 4d6a86539ca747eac8dd6a6b8e604ab37f310644ca98eadf9d0a7d0d3daa9beb

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