Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f5994ecc5e248a…

MALICIOUS

PDF

35.7 KB Created: 2020-04-13 13:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 235d12ba05f81b73763a7f96d8256aec SHA-1: 2deb04bf94c754a4be35bc74100d52f1e9895f1e SHA-256: d4f5994ecc5e248a00060c319a7bf94918e5eca7383e7e55765d3bb0e53878b3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a redirection mechanism designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports the conclusion that this document is part of a malicious distribution chain. No scripts were extracted, but the primary attack pattern involves directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://mdhelpinghands.org/uploads/1/3/1/4/131483019/131483019.html#ultimate+star+wars+trivia+quiz
    • http://echosprachen.de/uploads/1/3/0/7/130776847/jelejig.pdf
    • http://freetocompete-tx.org/uploads/1/3/0/6/130621758/kinawotub.pdf
    • http://brandsavenueoutlet.com/uploads/1/3/0/5/130588445/7596358.pdf
    • http://privatesectorpeace.com/uploads/1/3/0/3/130312968/55eaec77ff.pdf
    • http://rainbowbost.com/uploads/1/3/0/6/130620836/9137058.pdf
    • http://drkennethwainwright.com/uploads/1/3/0/4/130483271/cb20b4b507c36.pdf
    • http://austinacservices.net/uploads/1/3/1/4/131414134/5336819.pdf
    • http://drkennethwainwright.com/uploads/1/3/0/4/130483271/cb20b4b507
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006306.bin
fd233d57d46d090ce9280dddedf40577a59742b40540a20f2e13fafdbc4b2db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6306 8488 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.