Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef7d4005a08250b…

MALICIOUS

PDF

25.9 KB Created: 2020-05-24 07:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fe667aba4fd1ccade6d58db3be221bc SHA-1: 8aaf62ff8e7b9cbb8384e0fa8ee8af2424af8f61 SHA-256: 7ef7d4005a08250bcef512cd0b4278fe5180e3f536b0de8c3c3324b9a2d73569
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on newly created domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://lgcustomtravel.voyagerwebsites.com/uploads/1/3/1/3/131380811/131380811.html#tarjetas+del+dia+martes
    • http://rusticroad.band/uploads/1/3/0/4/130488888/1350372.pdf
    • http://earlgreybakery.com/uploads/1/3/1/1/131163651/zosuwesek_zizuzuge_zosavaxe_wawedetul.pdf
    • http://safemoneyagentlocator.com/uploads/1/3/0/6/130639862/tidetafozojopu.pdf
    • http://leasemyrv.com/uploads/1/3/0/6/130621490/fesufuzedudexa.pdf
    • http://rattlesnakeregiment.com/uploads/1/3/0/8/130814101/2834329.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_off00003eac.bin
31ed7566a6b0fb6de9d746f5309cf69dc5ad7e641fef99088fa8e5e224c47ace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3EAC 9360 bytes

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