Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8290812b6a9ed9…

MALICIOUS

PDF

72.2 KB Created: 2020-12-01 15:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ea65853ddebef11c7b1bac0a54adc460 SHA-1: db425e9f7177657886348961a4b1e46bf95d52de SHA-256: ab8290812b6a9ed9e2208e06c55ce8ec2c57f0ae4f25a210daa1272b8b144c0d
96 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffnew.ru/strik?utm_term=tekxit+3+server PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490125/normal_5fc56d9776fcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f9e429e72da3.pdfIn PDF document text
    • https://vujuzujotug.weebly.com/uploads/1/3/4/4/134478410/9aed630.pdfIn PDF document text
    • https://lufuzanexitib.weebly.com/uploads/1/3/4/8/134859686/63eca8a4ba7fea.pdfIn PDF document text
    • https://komulobuzol.weebly.com/uploads/1/3/4/6/134618259/3459110.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/koregusokix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5faa5306bb001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_5faa51cc94db6.pdfIn PDF document text
    • https://ralikinu.weebly.com/uploads/1/3/4/8/134883141/tefixew-xejofulomazugul-furisudef.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/zalomi/matthew_kimball_lemont.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/define_absolute_monarchy_sociology.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/nazosijenozilu.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/95795038123.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/tefuxe.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_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 4744 bytes
SHA-256: 813cbebd2ffcda24633ccd43c553e8af0198aaad9c57a7c72a82affcb86fa5a8
font_01_sfnt_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 10424 bytes
SHA-256: e916ea9ecec6ed5c85d6cdff6511bdfe773cf6d3eaf05cf5eae858135b06af60