Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f546df526e63be…

MALICIOUS

PDF

66.2 KB Created: 2020-12-11 14:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e4c0ed5568b60922a622c03b018a1878 SHA-1: 67a0da150677c95adcc84554f60828a36929a279 SHA-256: 10f546df526e63be2acacb7c2f65fb7e9afe5b7313c23b803076014b5fb0ee91
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains heuristics indicating it is a malicious redirector and uses a browser extension installation lure. It embeds a URL that redirects to a known malicious domain, likely to download a second-stage payload or phish for credentials. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=games+android+download+offline In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5fa8ca44c9b7b.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/91d27d9fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365560/normal_5fcd81e0f3296.pdfIn PDF document text
    • https://jegupifak.weebly.com/uploads/1/3/4/0/134018348/8468037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f87cc6371338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fd1dede754d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480893/normal_5fcbabf2e147e.pdfIn PDF document text
    • https://zurareren.weebly.com/uploads/1/3/4/5/134583426/5913850.pdfIn PDF document text
    • https://muzavixoro.weebly.com/uploads/1/3/4/6/134647253/subexusinozajel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc570c0d-f7cd-4266-ae5f-6ea884d23c22/mekenizuvoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6576d6-efc8-47fa-a00a-c22433589bad/18205230548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/502fda47-449e-4df5-a844-ebe02b46963f/nakonebexivepigudebil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a47e7ee4-7c12-4b56-a050-81eaf5350604/61732237626.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e08016f6d44b07cb8ed7/t/5fcbf7ce83d2ac65ccfcf43d/1607202767549/knowledge_is_power_quote_1984.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_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 5176 bytes
SHA-256: 619c5fc2691fd4bd120119673765a467d08f6704d575275a45879fd8639f7885
font_01_sfnt_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 10108 bytes
SHA-256: f2afaa7c9321f34e219c3f670170c011fc8e16796de5ef50df51417c209da0ad

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