Malicious PDF — malware analysis report

Static analysis result for SHA-256 827936af1af5106e…

MALICIOUS

PDF

27.9 KB Created: 2020-05-28 15:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43a5886eeff28b9473f4e9cd1124290f SHA-1: 315fc282faf3216753cfde973e0218e749853181 SHA-256: 827936af1af5106eb2c9c9d4993135a814bc28b579b1f3de9d6e5274d9bf6b69
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links pointing to various domains, characteristic of a link farm or SEO abuse. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external PDF links. While no scripts were explicitly extracted, the structure and heuristic firings suggest the PDF is designed to redirect users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://admindocx.com/uploads/1/3/0/7/130776083/130776083.html#leibniz+philosophical+essays+pdf
    • http://soutien-scolaire-manosque.fr/uploads/1/3/0/5/130551023/a0c77.pdf
    • http://effectivemobiledjservice.com/uploads/1/3/1/4/131453453/rumunuzo_piraru_ganuzusurozo_gofakis.pdf
    • http://thecreativeclick.org/uploads/1/3/1/6/131637921/murowe.pdf
    • http://just-the-blog-you-need.com/uploads/1/3/1/8/131871515/f191022a2665219.pdf
    • http://greenmonsterfilms.com/uploads/1/3/1/1/131163858/8900770.pdf
    • http://showcasemallvegas.com/uploads/1/3/0/2/130288563/ritimo_rogomagu.pdf
    • http://lummusbb.net/uploads/1/3/0/4/130483902/xugufozizuz_gexut_mudumoroboge_gogolufog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045c6.bin
d77ef404f976ae607305dc4877a08f82ba40f54dfc00a11e2c2e59743fb7a249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45C6 9160 bytes

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