Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b273272d039ac6e…

MALICIOUS

PDF

65.6 KB Created: 2020-12-09 10:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e3999159a2041d78fac354edda21fea0 SHA-1: 184224d6e95cb61fd01587f70c3ce1c717dbe16e SHA-256: 4b273272d039ac6edf6c5f63b261486e4942bc4eff8c462be75baccb443134e7
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are designed to redirect users to malicious sites, such as the one hosted on traffking.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

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.
  • 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://traffking.ru/strik?utm_term=run+on+sentence+exercises+with+answers+pdf In PDF document text
    • https://zujususo.weebly.com/uploads/1/3/4/6/134615591/5f81de.pdfIn PDF document text
    • https://kinoxumore.weebly.com/uploads/1/3/4/4/134463035/neziv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8e817d96691.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279037.pdfIn PDF document text
    • https://gorelafuxom.weebly.com/uploads/1/3/4/4/134497365/4658420.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/222db04bad.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/6272054.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/a06c5fe1-d398-4b92-b4ff-6d7d71985acd/91370980616.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce88ad9183b35ce70112aa/t/5fd02989a4b4ef2db69c4f60/1607477641761/waronigujedugegom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12ec9f7cf8c75402cc175/t/5fcb11ae8dcc5603beee28fa/1607143855314/88507713022.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56d932cf09257bd8a04eb/t/5fc81f58d17d55300fa16a1e/1606950747136/yellow_apps_to_download.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_off0000c3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E6 5380 bytes
SHA-256: 05269812ffa9a7741ae90a63f65c6cdda749cc36cef0f3f39c93145e029a378b
font_01_sfnt_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 10512 bytes
SHA-256: 8506ef10f6a125eb7694b35a1de5c9b95988eb170f36b23042dd4ffcc93fa3e2

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