Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c7515d5f7da14b…

MALICIOUS

PDF

36.9 KB Created: 2020-04-07 08:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea2676fc8b60e4a00cdf20aaef72e6af SHA-1: 0face45bcd9437d89fe78e581d089116741202ff SHA-256: 23c7515d5f7da14b851e836377a071b8e659b0d6cad15ca013b98bcf2b060d39
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 are hosted on domains that appear to be part of a link farm designed to distribute malicious content. The document body text, though partially corrupted, suggests a lure related to a 'vacation request form', which is a common social engineering tactic. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

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 http://sbest.space/uploads/1/3/1/4/131407088/131407088.html#modelo+de+solicitud+de+vacaciones+chile
    • http://straitsbon.com/uploads/1/3/0/3/130312991/5af4f217909.pdf
    • http://socialenvironmentsenhancement.com/uploads/1/3/0/6/130639821/godidulosi.pdf
    • http://cullenestates.com/uploads/1/3/0/3/130313021/733938.pdf
    • http://simonlloyd.ca/uploads/1/3/0/7/130739120/accf832c4f6.pdf
    • http://vanvolleyleague.com/uploads/1/3/0/8/130813897/dimimun_vidimetedijuz_xagupamaxutizot_noresok.pdf
    • http://scarboroughdispensary.com/uploads/1/3/0/6/130604125/powosibelunowifid.pdf
    • http://therealdavecarruthers.com/uploads/1/3/0/4/130476068/4f64365e42.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_off000066a3.bin
8ccd4398e624bf11203f3d9363d82e19b78aa43eb8d234e506fe076e7c66ba2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A3 8372 bytes

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