Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1fc7fe9702b224…

MALICIOUS

PDF

39.4 KB Created: 2020-03-29 10:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1565bc2f0046fc71d880823a3c6d69db SHA-1: 838d6efd4a67d6970c7b8d2043a95e029371620b SHA-256: 6a1fc7fe9702b224e3ed9cd5ed9c9af256e47e495b2d17fb3774b1a993493cd1
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, indicative of a link farm designed to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links suggests an attempt to distribute further payloads or phish users. No scripts were extracted, but the PDF structure and embedded URIs are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://nuohotel-zh.devsite-1.com/uploads/1/3/0/6/130639476/130639476.html#un+dibujo+del+aparato+digestivo+con+sus+partes
    • http://variancompany.com/uploads/1/3/0/6/130622061/1952033.pdf
    • http://cnc4me.co.za/uploads/1/3/0/2/130289509/wezadib.pdf
    • http://thegoodflow.net/uploads/1/3/0/2/130289319/zudovavesosoti_jibex_kevezawu_zewimoxabarix.pdf
    • http://gwendolynfloyd.com/uploads/1/3/0/4/130489696/bobewel.pdf
    • http://michaelamacpherson.com/uploads/1/3/0/6/130603945/xodolabojiwa.pdf
    • http://www.barebonesfarm.com/uploads/1/3/0/3/130379757/911110.pdf
    • http://trivatestyle.com/uploads/1/3/0/5/130590356/fuwan.pdf
    • http://redicdevelopments.com/uploads/1/3/0/7/130740209/2c6c85df825bd.pdf
    • http://martinaforgeyauthor.com/uploads/1/3/0/3/130313098/92d556ac222.pdf
    • http://goodsamnow.com/uploads/1/3/0/2/130287945/kudewizifamofafi.pdf
    • http://webdisk.humanconnectionsniagara.com/uploads/1/3/0/2/130272509/1d72e57bfc2689f.pdf
    • http://www.gormansgraphics.com/uploads/1/3/0/6/130639869/palelele_tikulaxuvezud_genegujurawu.pdf
    • http://218a4293p12rb.com/uploads/1/3/0/5/130550868/495183.pdf
    • http://matthewquinlanphotography.com/uploads/1/3/0/5/130542924/daxufub.pdf
    • http://cpanel.marriottediting.com/uploads/1/3/0/6/130620769/melijurupakar.pdf
    • http://smokeshowingnj.com/uploads/1/3/0/6/130604696/biwiba.pdf
    • http://www.katiecoxandcompany.com/uploads/1/3/0/6/130604752/naronubu.pdf
    • http://www.nwpregnancyandbirthcoaching.com/uploads/1/3/1/0/131070852/sexafusuwe_jefirinuro.pdf
    • http://wbilko.com/uploads/1/3/0/6/130639669/buxagiduk.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_off00006f3c.bin
9f8e3388bdf46a5d6aec2ea5b5b4dfc810a69921cceef0da3cacd1da472e101e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3C 8424 bytes

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