Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb78ba7b48427d66…

MALICIOUS

PDF

33.1 KB Created: 2020-06-01 12:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6bddc8b4c1ff73a9de881ddde986e0c SHA-1: 178b67abd399fa83a2ccbc1e840823a61dd13980 SHA-256: eb78ba7b48427d6655db7b3de071777a8ed5b2c1fd532052ab6f0e31a2160996
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1566.002 Phishing: Spearphishing Link T1204.001 Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains a large number of embedded external links, many of which point to domains associated with SEO spam or potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. The document body, though heavily obfuscated, contains a URL that appears to be a lure for free movie streaming, which is a common phishing tactic. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://autodiscover.jhigh18.com/uploads/1/3/1/8/131871734/131871734.html#watch+sausage+party+free+no+download
    • http://mytfillin.com/uploads/1/3/0/7/130776727/3690365.pdf
    • http://theme.com.au/uploads/1/3/1/3/131378821/457928842ce85a7.pdf
    • http://my-kenz.com/uploads/1/3/0/3/130323511/d82bba4e4c9.pdf
    • http://haggartbelting.net/uploads/1/3/1/8/131871462/4b28e49277ace99.pdf
    • http://123hamilton.ca/uploads/1/3/1/8/131856146/7400426.pdf
    • http://dev.chorusaustin.org/uploads/1/3/0/2/130291673/semowati.pdf
    • https://fisatet.files.wordpress.com/2020/05/tafewifaxazavowomuxig.pdf
    • https://mapomipat.files.wordpress.com/2020/05/xokegatozuxarakoremagi.pdf
    • https://wutatume.files.wordpress.com/2020/05/52612862818.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_off00005272.bin
c30e03689281700e3dd735de135527d177123236e0a7f4498caa0873ec77fa0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5272 10832 bytes

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