Malicious PDF — malware analysis report

Static analysis result for SHA-256 b789c284517ef006…

MALICIOUS

PDF

69.2 KB Created: 2020-12-08 05:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: df908e21cad4f336e7a98599aaf930af SHA-1: 6b4514f5eadcbc0798e17996b8d9b358fee3a8be SHA-256: b789c284517ef006fb98c9c817e4c278d6e5df56fd8fb91aeebd9563e4c82324
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a deliberate attempt to direct users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to deliver a second-stage payload or phish for credentials.

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/wb?keyword=battlefield%20sniper%201%20%20android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_5f91f1f8f195b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f8e3b05eab59.pdfIn PDF document text
    • https://pupiwikupexi.weebly.com/uploads/1/3/4/3/134348736/6449672.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fcdff5f790d063a90a849dd/t/5fcebd57788d7c4f39bcd6e7/1607384408998/mazodufelojexif.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d3bb48c1673e5598f85d/t/5fcb56f5190ee82df8db38f8/1607161595858/40146204264.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/business_communication_full_notes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfb6d9d104e5f152dbf8f/1606220659325/braun_coffee_maker_filter.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5423d2e537a05ef25b386/t/5fcc017f6f0099009e4eb32c/1607205248493/46770473631.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53c1cf7cf8c7540473628/t/5fcbd2871415195da090354d/1607193226637/vubepopisek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc538fa6b97992eb578077c/t/5fcef0a669d6d06d553404a1/1607397550614/junukunav.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/ap_government_and_politics_notes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d446ab79f442f2293e00/t/5fc241109b1ed03538263c46/1606566160964/poputizijamonus.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_off0000cef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF8 5136 bytes
SHA-256: ed3a0cd715e071488ab30c1b31bb75b35d0e34dd095c7439a59ba481b0919c07
font_01_sfnt_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 11756 bytes
SHA-256: cde6127e1e14e37c38f2d21f3f1395781ddf1efa23cc7d6b8892d8168bb3cd46

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