Malicious PDF — malware analysis report

Static analysis result for SHA-256 000f76386641dc55…

MALICIOUS

PDF

35.6 KB Created: 2020-04-10 16:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4a2acb87a3bd439148fba9a03c6d5415 SHA-1: b89c92d387869aa91873dfb126aa60ab1ad89ca8 SHA-256: 000f76386641dc552a497c6efa6e80430a2b66b0cc5b37e7de44c0f2eea9662f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains numerous external links to various domains, many of which are structured as numeric slugs and appear to be part of a link farm. The ML classifier strongly identified this PDF as malicious, and the presence of a 'download button' heuristic further supports a malicious intent. The document likely serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dogemoon.net/uploads/1/3/0/5/130551487/130551487.html#easeus+partition+master+technician+e
    • http://rejuven8bodyandbeauty.com/uploads/1/3/0/5/130540240/0e71b34c34d4f3.pdf
    • http://projectgradgrant.com/uploads/1/3/1/0/131070375/bawep.pdf
    • http://shiuan1021.com/uploads/1/3/0/5/130590368/jurodij_godinareka_zigadinibowa.pdf
    • http://happilyevertalbert.com/uploads/1/3/0/6/130621093/robuges_palijodasanus_fusowubaker_garidolagu.pdf
    • http://riley-realtor.com/uploads/1/3/1/4/131408788/4533597.pdf
    • http://sangev.com/uploads/1/3/0/5/130544257/xukobadakarir_vuralitutepod_besepizujiveruv.pdf
    • http://sweetmagnoliagallery.com/uploads/1/3/0/4/130435726/bebadomepotazul.pdf
    • http://undisputedphotography.com/uploads/1/3/1/4/131437563/gegebazanaxetobaw.pdf
    • http://delooted.com/uploads/1/3/1/4/131437409/tejital.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_off000061fa.bin
e54c530c09fe5e983a25eafd751ead64e28d76ce6b1e656b00d3899ce7b75d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 8184 bytes

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