Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e8d2153b32e200…

MALICIOUS

PDF

33.7 KB Created: 2020-05-28 10:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 176d1a19c0aa7ed9815c781d38a76872 SHA-1: b0193887b68520968b2c9d598157379da6849f38 SHA-256: 73e8d2153b32e20038b3f1aca7382d20cdc5e3904208b69183a8ac589fda58e3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text and extracted URLs suggest a link farm or redirection scheme, likely intended to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cozyoasis.com/uploads/1/3/0/6/130639575/130639575.html#sto+fleet+science+consoles
    • http://shastapaddle.com/uploads/1/3/0/8/130814909/pixonilujuv.pdf
    • http://recruitingbasesoftware.com/uploads/1/3/0/5/130588948/4292864.pdf
    • http://rowdyweed.com/uploads/1/3/1/3/131398338/wodabojufozota.pdf
    • http://wendyjoyoils.com/uploads/1/3/1/4/131452929/zibupatebirowanari.pdf
    • http://webdisk.velvetsecretshair.com/uploads/1/3/1/3/131380456/majobex_xusif_rogagutina.pdf
    • http://whiteysamericanbulldogs.com/uploads/1/3/0/5/130590687/1f88c2d.pdf
    • http://receptordetox.com/uploads/1/3/0/2/130273798/5442478.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_off00005776.bin
75193f7cc65aa9572c31a9460dbb464f7b976c65713a3bd4e084b56965afcee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5776 10788 bytes

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