Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54ef6bf097e9395…

MALICIOUS

PDF

34.8 KB Created: 2020-11-09 16:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 545ee3ac6f3ec0b676b68f6b6ac702cb SHA-1: 25caa72f7139ff79dd0116af3e4634fb94b523af SHA-256: c54ef6bf097e939506047b463bcd37e76f222d00a05ea57be9457a980f668816
66 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains embedded URIs. One of these URIs, 'https://trafffe.ru/aws?keyword=briggs+and+stratton+675+series+owners+manual', is presented in the document body and is likely the primary lure. The PDF also functions as a link farm, hosting multiple external links, suggesting an attempt to redirect users to potentially malicious sites. No scripts were extracted, but the presence of embedded URIs and the link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffe.ru/aws?keyword=briggs+and+stratton+675+series+owners+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5fa469714f9fd.pdfIn PDF document text
    • https://rubovumalez.weebly.com/uploads/1/3/4/4/134458479/4872791.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/342536051de708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5f8ab70b58898.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/cb57169df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5f8b2b9bc1872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f9c981358282.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/3381466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5f8a30e26b4da.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/5801073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_5fa818f470fa4.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/9714766.pdfIn PDF document text
    • https://veborikaja.weebly.com/uploads/1/3/4/3/134317734/ripikimes.pdfIn PDF document text
    • https://favasebuwakule.weebly.com/uploads/1/3/4/3/134328846/nixuranorupixedud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_5f9c8094baa5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/priyanka_chopra_net_worth_2020.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_off000047ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47EC 5644 bytes
SHA-256: f4fdec599720c602d2eaee7a103c749604623db56c099f5b9d87da216496d0a9
font_01_sfnt_off00005b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B22 10264 bytes
SHA-256: 618372800b00894b9855b0119b6c6b82c06ee61198b46846cd5f0e963660997b