Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8af5b00a89da659…

MALICIOUS

PDF

75.6 KB Created: 2021-02-09 19:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 104dd36d8411520a4039531ad915bbfd SHA-1: 935a9a2aa9c763451bd3d9abaf16e75c4b64fa6d SHA-256: f8af5b00a89da65993e2f44c18ea71597c15941f39b0c5534a886a19a6f0604f
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'ryan kelly singer bio' and 'wkhtmltopdf', suggesting a lure. The numerous embedded URLs, many pointing to disposable domains or link farms, indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://crophysi.ru/123?utm_term=ryan+kelly+singer+bio In PDF document text
    • https://zutomufafet.weebly.com/uploads/1/3/1/6/131607254/lijuxi-rufuroweror-torovi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488566/normal_5fc736bdae8ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388596/normal_5ff9aa6c51035.pdfIn PDF document text
    • https://kevifuzokidoku.weebly.com/uploads/1/3/5/3/135310888/fixigokatip.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/a133c5ddd.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/d4855039b0764f.pdfIn PDF document text
    • https://rosokejasos.weebly.com/uploads/1/3/1/8/131871530/7981397.pdfIn PDF document text
    • https://jiwifibim.weebly.com/uploads/1/3/1/4/131437351/lebupatajajazo_wipaxixudofofu_zijoxuludi.pdfIn PDF document text
    • https://wakukorukizine.weebly.com/uploads/1/3/2/7/132712206/dfb841f0.pdfIn PDF document text
    • https://detawokigar.weebly.com/uploads/1/3/1/4/131453745/6dc0001da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365608/normal_5fdd47f837652.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuwuxubemepimox.rf.gd/employee_kpi_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/pozunanalijudupibumejix.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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 5168 bytes
SHA-256: de173db1a9dc0c8e50cc753a180cdca3db6d99031ed82431493732e16212531f
font_01_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 10608 bytes
SHA-256: b1e8533542e6cfeae73ae496ca05b461d0c4d796298917d76aaea73e46be825c

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