Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbd3c799be7ed8d…

MALICIOUS

PDF

71.4 KB Created: 2021-01-14 05:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1ee3f43eefcac3181b8c424346687a24 SHA-1: 7e05eb9d5fc53a23f1cfdc1234465f69ddbaa50c SHA-256: 0cbd3c799be7ed8d69e24566c935d5e8e10ca77d44e58187255384e91d0283ad
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=chevy+tahoe+forum+2019'. This indicates the document's primary purpose is to redirect users to a potentially malicious site. The ML classifier and ClamAV detection further support the malicious nature of the file, suggesting it is a phishing or trojan distribution attempt.

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://cctraff.ru/123?utm_term=chevy+tahoe+forum+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5f9e607b312d7.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/herpes_simplex_virus_culture_w_rfl_to_typing.pdfIn PDF document text
    • https://site-1180062.mozfiles.com/files/1180062/27672999569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fbb8f3ad41b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_5fa513394aeb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5f8d9e986f2da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_5fbc79efd14bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5fcafab2b56c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fe4e2e633790.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/farefasejikap/85506942589.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/52053071935.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/clash_royale_macbook_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/becket_keys_sixth_form_application.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/meaning_of_balance_sheet_in_tagalog.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/printable_contraction_worksheets_2nd_grade.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_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 5348 bytes
SHA-256: c260d0f2a00f3e1fe5c4a7e5d8a6ab4468adcb0aca3fb8f08ce3964707bae485
font_01_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 10428 bytes
SHA-256: 37114b1d5c0bf5090cb358722554cee59be9942b6f570fac000edf3e9661a4cc

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