Malicious PDF — malware analysis report

Static analysis result for SHA-256 1440fdd75fe13f93…

MALICIOUS

PDF

36.0 KB Created: 2020-05-30 07:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c315e85072f346b6cd4c2dda4e85d30 SHA-1: 36d16961960c2e6f93c4624fc6195e755969f85d SHA-256: 1440fdd75fe13f93e1f58cfed08b473ff82e7c9002b365db0b2c36dcc9f796b1
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a coordinated effort to distribute content or manipulate search engine results. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score suggest malicious intent, likely related to SEO spam or potentially distributing further malware. The document body itself is heavily obfuscated and contains some of the same URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://host206.carmichaelnl.com/uploads/1/3/0/8/130874169/130874169.html#francis+ponge+le+cageot
    • http://dhfempreiteira.com/uploads/1/3/0/8/130874526/16323778a7e3.pdf
    • http://skyscraperzpainting.com/uploads/1/3/1/4/131483453/wavimazobulokamenu.pdf
    • http://mayiharvests.com/uploads/1/3/0/5/130588716/fokemewikedo.pdf
    • http://lifeinyourkitchen.com/uploads/1/3/1/4/131453329/solejosi.pdf
    • http://elementsofsedona.com/uploads/1/3/0/2/130272496/9387141.pdf
    • http://byrdtransportplus.net/uploads/1/3/0/3/130324170/getiwiz-givajew-raduve-xivipopubet.pdf
    • http://smith-chiles.com/uploads/1/3/0/7/130738881/0c9457fea2.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_off00006003.bin
f9b7a7f25844bc6f999195d624ff7c654af5fe1da3fe88b9a2239ee97b54f0e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6003 12128 bytes

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