Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9db2a2c58a36d1…

MALICIOUS

PDF

73.5 KB Created: 2020-11-14 05:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9dafd47e5fe9ad262f5dc5e762d2d62a SHA-1: 9d0d18f6c5e298b2e712356aa8252eca9e2bd475 SHA-256: be9db2a2c58a36d12589cf841c47f2c8dad61c06424598089c6b0658a5351a9f
264 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • 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://cctraff.ru/strik?utm_term=esperanza+rising+project+ideas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f88c66447324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421624/normal_5fa0c8755f33c.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/7444479.pdfIn PDF document text
    • https://zekuwatifakaxi.weebly.com/uploads/1/3/2/8/132815855/9474997.pdfIn PDF document text
    • https://doxifivot.weebly.com/uploads/1/3/4/2/134235468/wiwewatabigeze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f8b5ba650863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f8b469f94a16.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/5453699.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/ae327760746.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pujinit/one_container_empty_returns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9da6031-2b09-49f5-9732-a968406fa65c/24573738516.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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 5080 bytes
SHA-256: 081e3ee41d033aa58d75f4e999f9e7ac89193e94d7f42cdf9c1e8275d740e299
font_01_sfnt_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 10624 bytes
SHA-256: c48a63ce38d850348fcca1cdeec5a7babebe332d256f435cf9582b9998d2fc22
font_02_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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