Malicious PDF — malware analysis report

Static analysis result for SHA-256 416b8cf8df195f07…

MALICIOUS

PDF

38.8 KB Created: 2020-04-05 07:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 0f58f3e7a66b062730f104b8a7b254bb SHA-1: 38e2b34e2f85b196da7ae3a0e7284e4529d9c0b9 SHA-256: 416b8cf8df195f07cfd2a905bcc034c05e34bcf8e9135512fce14e7299b54267
136 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: User Execution

The PDF document contains a large number of external links, many of which point to PDF files hosted on various domains. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates that the document's content is designed to trick the user into installing a browser extension or update. This suggests a social engineering attack aimed at credential theft or malware installation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://theothertd.com/uploads/1/3/0/6/130621502/130621502.html#how+to+draw+a+piece+of+cheese+easy+cream PDF link annotation
    • http://sydneyunitedqueens.org/uploads/1/3/1/3/131384789/jilasabovefela_jisadivoxezew_bedudit.pdfIn PDF document text
    • http://nikavikasisterhood.com/uploads/1/3/0/6/130605283/kiguzurixilos.pdfIn PDF document text
    • http://pwrwod.net/uploads/1/3/0/6/130604744/kubesewadamujowiwav.pdfIn PDF document text
    • http://barbattu.com/uploads/1/3/0/6/130604720/5c568f2c973d210.pdfIn PDF document text
    • http://appcommissaris.nl/uploads/1/3/0/7/130775176/narin_vupor.pdfIn PDF document text
    • http://jscachow.com/uploads/1/3/0/6/130639990/nemotofulus_tuguruvosoroka.pdfIn PDF document text
    • http://100limites.org/uploads/1/3/0/9/130969341/mezitemifemixo.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
🗂 Part of campaign: 100limites.org 3 samples

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000700a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x700A 7756 bytes
SHA-256: 10fc110f5ccd4ed0885e3ab91b8b587e3a08639b20906fcbb61f0eaa2fd529d4

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