Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70cc8f1156f4332…

MALICIOUS

PDF

166.4 KB Created: 2021-02-18 19:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b1984e47f16e27e00344d9213dd0e133 SHA-1: c6d425de1b41c6f91e245434bc4ba384fc32704b SHA-256: c70cc8f1156f433233cdb85eca775bb96feca961145c1f242e5c6273fc10b460
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://yafferge.ru/strik?utm_term=the+taming+ofthe+shrew'. This URL is likely used to lead the user to a phishing page or to download a secondary payload. The ML classifier and ClamAV detection further support the malicious nature of this PDF. No scripts were extracted, but the embedded URL is sufficient evidence of malicious intent.

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://yafferge.ru/strik?utm_term=the+taming+ofthe+shrew In PDF document text
    • https://guwevene.weebly.com/uploads/1/3/1/4/131437413/lelovajinow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5fcd623bb7ce9.pdfIn PDF document text
    • https://cdn.sqhk.co/rafumufo/hgZjdgd/directv_customer_service_phone_hours.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454968/normal_5ffe4d64867fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375890/normal_5fcaed1e9edac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459917/normal_5fd03a226c5a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385028/normal_5ffc4e5b1dc41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5fd60fdbe8a82.pdfIn PDF document text
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/fuman.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fcbfbe28d564.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/lavoxubexivalezog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_602d392f78e05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_6010e2bc18263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530937/normal_5fcd8ee4bbfd8.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_off000257e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x257E2 5192 bytes
SHA-256: fe682070f407212eedd9160cb399a4c6f110ba8fb7fd2680e2cbf9bea360792e
font_01_sfnt_off00026979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26979 10252 bytes
SHA-256: 97130d4d1bfa44f8ebd6b6406770302a0e13c6cace30b9e2fcefeb83cd17287e

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