Malicious PDF — malware analysis report

Static analysis result for SHA-256 90487b0ed51c667d…

MALICIOUS

PDF

72.8 KB Created: 2021-01-03 23:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9db209b3d654ffb07d4b0346c53cdb95 SHA-1: 7009639d0ce9e33ba3a3fc6ee10ab3d99263fff3 SHA-256: 90487b0ed51c667ddf2b73c0acf18d6c2ea0a2f834c00907ecdc77a5e1350f3c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, directing users to potentially malicious websites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=farberware+electric+pressure+cooker+manual In PDF document text
    • https://cdn.sqhk.co/karapazepot/4hfrrij/ten_million_zero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5fb2c69dd2227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389387/normal_5fcf2813483dd.pdfIn PDF document text
    • https://cdn.sqhk.co/fukefipemuw/KE5whif/carlcare_infinix_warranty_check.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_5f96e8f375bc7.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/afee40a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_5fae469b391f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f8927c10e42d.pdfIn PDF document text
    • https://xukoxaxap.weebly.com/uploads/1/3/4/7/134748194/volexezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f8acda91a0bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5ff0c1eb8b39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393900/normal_5fa48b9124c68.pdfIn PDF document text
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/833ffa318f6a.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_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 5332 bytes
SHA-256: 572093a5da1528d9095767f39a1abfbea4fd08e64f402a0efc69ce53e4a17965
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10688 bytes
SHA-256: c30b12de5257c0318343c3d04d30e46fcdae82287b5fb6f4f591d82ab1431d38

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