Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d38f0573751e6c…

MALICIOUS

PDF

38.2 KB Created: 2020-04-05 13:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d242234bc2e625f6f0b975b7a4511f33 SHA-1: fd1a44d1fc53a3ae004674d23e986b263b4f68cb SHA-256: 69d38f0573751e6c221b9e02d9e3d25e835c6df12f729b08bf6a4b636a0d3d1e
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure suggests the PDF is designed to redirect users to a network of potentially malicious websites, possibly for SEO manipulation or to host further payloads.

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://space2dream.com/uploads/1/3/0/4/130477605/130477605.html#que+es+filosofia+moderna+resumen
    • http://thedroneguy.info/uploads/1/3/1/3/131380598/7e8b5795b4d9e9d.pdf
    • http://emilydewberry.com/uploads/1/3/0/5/130550960/377693.pdf
    • http://springgrantservices.com/uploads/1/3/0/6/130640146/19fe3b92a30af.pdf
    • http://adukeandduchess.com/uploads/1/3/0/6/130639424/xibuviza-bijotavubikib-norego-zedokeforoweta.pdf
    • http://7daysfresh.info/uploads/1/3/0/3/130324324/ziredesov.pdf
    • http://innovationclassoom.com/uploads/1/3/1/3/131383746/8575786.pdf
    • http://sweetboutiquebakehouse.com/uploads/1/3/0/4/130489275/lonugutesuzi.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_off00006dd9.bin
7428e7af97557e18a7abb3fc9aca3b61ebd1ed9823520575ab5576676131a77d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD9 8316 bytes

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