Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c57798e838a359…

MALICIOUS

PDF

36.3 KB Created: 2020-10-25 21:20:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 27dd928b0f03ad2c9473039fb831706d SHA-1: dba45b814b380128570b63783aa4e25e02bf46ac SHA-256: 15c57798e838a3590f2c4640dde1fd4ff0083bca56b5d47e62c6f1bfc1a03fc7
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 1.0000

Heuristics 5

  • 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://ggtraff.ru/aws?keyword=pdf+calendar+calendarlabs In PDF document text
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/rekevijix_vebutozetomifaw.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/jibepare-vudaramuzi-refirezagulele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5f92580764dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5f90f30e52b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f871e6d16ade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f87ef523d6dd.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/6870013.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/736f0b.pdfIn PDF document text
    • https://tebefatudu.weebly.com/uploads/1/3/4/3/134329870/gukaserixolepevozetu.pdfIn PDF document text
    • https://raxuzorufureraw.weebly.com/uploads/1/3/0/7/130775378/siruzewabami_refovafirux.pdfIn PDF document text
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/d87845d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5f95c471202a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_5f9520b4697c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f8e46c5761e8.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/a03e48c5-fd08-4ff7-8874-b2c657085add/judaxivalipedigasax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fd3603-e03e-4f22-8aa8-0f6cd489738e/supobegoriselunif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a9d974a-2efe-4f7b-b310-a5d3a48ed4b4/fesurosulakenujopowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66bb47e-30b9-4d2e-b681-88af6829ee4d/tezinitosudonowij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ff6922-65d7-4a9b-b69f-2d4006ffb891/sezefaxef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba750328-a857-4e55-805e-93b8b51eb354/afyon_yaptr_arksn_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea68c67b-930f-4638-812e-9bafc9f55bfa/94340317828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75dcdd0e-0d7c-42e3-8127-dec6da8b9e8e/xukepigezikadugadum.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_off00005069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5069 5156 bytes
SHA-256: d4adbd9e87296aba225520dbaaebf73a513d7025bc2f943846941dbe1bd62921
font_01_sfnt_off000061f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F7 10068 bytes
SHA-256: 154f394364836e69760ec92af70b9565fcb53fb3f017cda3aac543097ee3dc66