Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e37a5e015d981af…

MALICIOUS

PDF

78.7 KB Created: 2021-05-29 12:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0448a9d11a59f10ee4ccb5ce08297181 SHA-1: b15dbc80a75f7e4a0993e1478c2a36db595e1af8 SHA-256: 2e37a5e015d981af9e52d41d1ae0bee6b86f19b92a55bf52aeced57ccda22c2e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm or SEO manipulation scheme. The primary external URI points to a search result page, indicating a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/wb?keyword=who%20owns%20sea%20ray%20boat%20company PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453332/normal_600fea78985ec.pdfIn PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/darinum-makurodafoji-vumidu-gosusorenitul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_603ff927ec235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_606cc4074c2dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_606178e5d64ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487194/normal_5ffce34d00790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_5fd7b3ddc23f6.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/borafoletinu_ketivetej_kunofisubuwip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_60451277cb955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408324/normal_5fca23e88103e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5feb7664cd128.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/ca533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491433/normal_603a0f9e4ae0a.pdfIn PDF document text
    • https://denofunafefu.weebly.com/uploads/1/3/4/7/134750316/kuvenisor-gonojepo-tovip.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/nilugexavikokafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393486/normal_5ff40acab91c6.pdfIn PDF document text
    • https://zejaxosadakawur.weebly.com/uploads/1/3/4/3/134372542/pugok.pdfIn PDF document text
    • https://romesezex.weebly.com/uploads/1/3/4/6/134605020/8489424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_604197f460515.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468820/normal_5ff11d45d2a28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_606b51ab8e741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5fd61b8e2aad4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428039/normal_5fe223638e8f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527108/normal_5ff2913c7e057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 5488 bytes
SHA-256: e41b0d93797ec92fe8fd1868bd9a7eb8331cc42ceb450c48da4643091c4b7d54
font_01_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 10580 bytes
SHA-256: 68cefa7c13dc2b9c03da082c105faf0c22c56f309c545ec9678e38353fc72243