Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ad5af9e09dd7f1…

MALICIOUS

PDF

78.5 KB Created: 2020-05-24 08:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e32031735de55a3be8ef7ea9245d0af SHA-1: e3383ffd9bd8ce744a51963d05467ab8f2117109 SHA-256: 11ad5af9e09dd7f1a15cf60df8c9774abe5e64a5b03579443716aeaf0c785c57
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9543

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://ls7xy.bpmtc.com/uploads/1/3/1/3/131380404/131380404.html#landscape+history+and+the+pueblo+ima
    • http://realestateagenttaxsavings.com/uploads/1/3/0/2/130272472/sakizosu_delixo_gunesefidafo_wusexagewuwe.pdf
    • http://failsafetrading.com/uploads/1/3/1/4/131406649/e609c7f552aa4.pdf
    • http://star-method.com/uploads/1/3/0/5/130550948/7503158.pdf
    • http://seymourstrategies.com/uploads/1/3/1/3/131380788/cc11b1.pdf
    • http://kehoepackaging.com/uploads/1/3/0/3/130313057/8641896.pdf
    • http://creationsbypinky.com/uploads/1/3/0/4/130483408/nenisek.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_off000108a5.bin
f27b29e2c930476aa474c8d0c601c5dc46108d093af6f75ac4756ac8f3fa5cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 11368 bytes

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