Malicious PDF — malware analysis report

Static analysis result for SHA-256 28678d56b81dde25…

MALICIOUS

PDF

38.0 KB Created: 2020-04-07 02:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f9e1debcabb6ec7ae3f7e11196d42006 SHA-1: eb494e0b2e9c65cafca306ea6d6685ca71e422fa SHA-256: 28678d56b81dde2529c0c8cb0c405532ae6c0355e2771227af0e245c579553d3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm or a phishing lure, directing users to various external domains. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://sixtarubio.com/uploads/1/3/0/2/130288379/130288379.html#19.1+prepositional+phrases+and+appositives+practice+1+answers
    • http://ieastaffing.com/uploads/1/3/0/4/130490036/8760712.pdf
    • http://realestateagentcadway.com/uploads/1/3/0/5/130588377/c5ae1ed.pdf
    • http://ylfreedomteam.com/uploads/1/3/1/3/131398591/7329915.pdf
    • http://liveyourplay.net/uploads/1/3/0/5/130590312/kamulal_petomilajok_sinej_wisowates.pdf
    • http://yunspm.com/uploads/1/3/0/2/130289279/lilefawiluzikujizib.pdf
    • http://weldingandrepairs.com/uploads/1/3/0/7/130739006/78abef2e9f.pdf
    • 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_off00006c2e.bin
0abc3f62ba0ff858ab17e4efd458cd4c958c29ab7dfb11e640542ce6952d2e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2E 7944 bytes

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