Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b9f220716239f3…

MALICIOUS

PDF

66.7 KB Created: 2020-11-24 03:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 59314a30b0ccbd861e4e3801376bbbb8 SHA-1: ba85bf6fe9f97341a30e1a364214d83aa7e5df11 SHA-256: f6b9f220716239f36c6fb68a1b733da3c99a50e5d8b686f9daaf01658cb3ff26
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm for SEO manipulation. Although no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content.

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://cctraff.ru/aws?utm_term=reservation+in+promotion+dopt+guidelines In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f8f049940f02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f8aa54ae5be5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_5fbc3a254da7c.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/319c4bd274986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411683/normal_5fb38f9c35f90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_5fa7983e265b4.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/pexodugosa/ferapiziv.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/29763109743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb0d0691-e39f-45f4-83dc-d803d3072ea2/filuvodumabanezarefesivi.pdfIn PDF document text
    • https://s3.amazonaws.com/tekujel/80745949174.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_off0000c7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CE 5344 bytes
SHA-256: 7aee0be83db3d25f7bac19a0af9d3a1b7ef83ab5ac1266de44e0881d3af4b150
font_01_sfnt_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 10676 bytes
SHA-256: 57f2663fd67579f0c326df741edd930831b6399a65f89726efd4d77451f3ad9d

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