Malicious PDF — malware analysis report

Static analysis result for SHA-256 b852b90aaeea103f…

MALICIOUS

PDF

72.3 KB Created: 2020-11-24 17:48:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d225948eb6982373a7ea6e6634df5a21 SHA-1: d60d1e6b00830a8fa8e703a6b197d637904e9a98 SHA-256: b852b90aaeea103fe9ccd196ca6343510a2d3b4394e25e505a88b68c2216c63e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/strik?utm_term=english+for+everyone+book In PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/eea92587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5fa95b564ee2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f8d15a8c205a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f8728cba7770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5f95a8a140b73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f968dfa2eaa3.pdfIn PDF document text
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/vutilew-vajutekudew.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/d6c980e2-8ffc-482d-9922-312fa4cb562a/84118507742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53530525-1747-42cc-95c7-68dd2c428eef/wumuzonakatozegonuwukavov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a690a36-8958-4ff6-a67f-0d347d43f57a/32057734086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/462ce78a-5017-427f-8a12-81cf41fc19f0/16599441578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab9a73a-10de-41a8-8469-c66c515f0f7b/revovalawepotubabapofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5eb473-7ff6-44c9-843c-8882360c89cd/25534490715.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 2940 bytes
SHA-256: 72b815926571ed76dcdb15ba0f925f8be737f518649be50e3ea36e0fc125b231
font_01_sfnt_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 5144 bytes
SHA-256: bb0ee7ef22b86f3fab4ee1ff9b8b32ce2b11803dc94dddad822697ac64b97ff4
font_02_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 10304 bytes
SHA-256: 9ad6dae1aa886514bee258787cc1efecb7163d5d2a66c67e37c36f01e667fee2

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