Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6b37821a70b8b3…

MALICIOUS

PDF

65.9 KB Created: 2020-11-29 05:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8f0f1bc9f301c25532635b8c8ece1dec SHA-1: b4e84f6173cafd16c79e421de743206345d001ed SHA-256: cb6b37821a70b8b3943f8b84b4e84bbceb9b93b72b2e67bd3448cd163635bd33
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=wwe+unblocked+games In PDF document text
    • https://giwisosolu.weebly.com/uploads/1/3/4/7/134752077/jugurekewokosatafito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_5fb899df76c29.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/jefakokararemoxukizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5f9f7a26185bc.pdfIn PDF document text
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/b2ed836972def.pdfIn PDF document text
    • https://metumarexidema.weebly.com/uploads/1/3/4/5/134591821/zeguzamuganifikafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5f96c830c60d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410988/normal_5fb62a57ec209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5f9d4c5648de2.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/fac378f2-f1d3-4535-8d28-a0fba3e00e60/please_draw_me_love.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/zowoxi.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_off0000c4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B8 5472 bytes
SHA-256: ee298348c0bcf04b89d41bcf96bdbbf131ce96a83ecb423b8a3d87a08601811e
font_01_sfnt_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 10564 bytes
SHA-256: 52d453d8f0f0cf8464ff57d70989847a0329e7fb00924331385a309ae9093149

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