Malicious PDF — malware analysis report

Static analysis result for SHA-256 35897783cc7f92a2…

MALICIOUS

PDF

72.1 KB Created: 2021-01-10 07:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: eae2729eafb989a5581120829d6449cc SHA-1: d5c1c7b1baaea8b606bee4f364f9c7e1fdebd87b SHA-256: 35897783cc7f92a200d031a19006fc2536a0ce2ff8deddf101cc92b54f75dfa0
214 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many pointing to external PDFs, suggesting a link farm or phishing campaign. The presence of these links indicates an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffking.ru/123?utm_term=victorian+age+male+names In PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_5fb2c8e4edbb1.pdfIn PDF document text
    • https://levufaki.weebly.com/uploads/1/3/4/7/134743196/vagiwulu-tajuvo-loxexen.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/4c8f074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5fcc18a8bc180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_5fad67bcc8eda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5fd64f677a677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_5fafed626bb11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5f8e1a57d5125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470533/normal_5fba83389e33a.pdfIn PDF document text
    • https://garusase.weebly.com/uploads/1/3/4/6/134634063/9658816.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 5084 bytes
SHA-256: e25eec453a54b379c8892eaf9b2570766c6a5cf04221607d2dec7731a9d6a5f7
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 10176 bytes
SHA-256: 752cca4ec04ec565613606df58d2bec388f0ae650eceffd0526f2eb890147b6c

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