Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8daf73a828e80ca…

MALICIOUS

PDF

68.0 KB Created: 2021-03-20 07:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7bce3bdfb6ddaab0ae6020bf30d8c6e2 SHA-1: 203dd3c0be4b132aba9d952eca0ea2c48ccc8064 SHA-256: a8daf73a828e80caa55bc0713afbb2641765de5cbf85ee5d5ca7865b4cc821c2
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/wix?keyword=nike+dual+fusion+run+2+orange PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402721/normal_5fe65e6840776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5feb16bf7edb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421224/normal_600b4c2f3d7dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449184/normal_5fc5cf471b6ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5fda1bfc9bbe3.pdfIn PDF document text
    • https://pajodutakimileg.weebly.com/uploads/1/3/4/4/134474341/47aaf24f812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_6010f7ad2daf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_6022baeb5ee8b.pdfIn PDF document text
    • https://nerupeke.weebly.com/uploads/1/3/1/4/131483009/rekusawevotuso-pusanixabaw-tavivuwujiwox-nujan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_60152cce37bea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_601b37dacf8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_600a4c7007aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_600aa5a387df4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5ff0b6a9716e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_68cb829b49584bf1a4c694edd63a8f52.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_d234e34dd1844f0489a4efb1b6b19e0f.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_8c5318f01dba40b19977037b40994c45.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_90205151dc6541f0a8010ad474527ba4.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_047a28f8c3144ef49f8078ec6ecf6e16.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_ebfa930a0fe243d4bda9e58a7b0c487b.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_271a2afcf40c4a3d9457143bdda0ae5b.pdf?index=trueIn 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_off0000cb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB04 5240 bytes
SHA-256: 96eccd28121e5610f47bc4e2ce166583d843268b978bcb6d921ad32680b6922d
font_01_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 10684 bytes
SHA-256: e65740831550ef832f6575ce1d2775b269a6004970357963b845c017b30f877a