Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ab6dc0d589b161…

MALICIOUS

PDF

38.9 KB Created: 2020-05-27 04:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb2d1daec26d21c5dfcb474cb3c8ae70 SHA-1: 7942de8dc8b00911883fd55bc4ba548129c3349d SHA-256: d1ab6dc0d589b161ed911f499222701eae3ec92a50b40f6e924b4fdc0c5ff9f0
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files on various domains. This technique is often used to obscure the true destination or to distribute a variety of malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 3

  • 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
  • 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://ruchirakittens.com/uploads/1/3/0/6/130620578/130620578.html#salaire+keller+williams+salaire+d%2527%2527a
    • http://hostmaster.imarkv.com/uploads/1/3/1/3/131398140/pugaminas_xebumos_fibujuxejul_mojapugitidav.pdf
    • http://escapeergo.com/uploads/1/3/0/7/130738615/beparedekur-difigaxebuvob-simigis-xalijasel.pdf
    • http://aboxofmemories.com/uploads/1/3/0/4/130488816/3667a9124fda.pdf
    • http://amd11z.com/uploads/1/3/0/5/130590243/nexisonanorefi-metamowado-baboni-manisu.pdf
    • http://caffegiocondo.com/uploads/1/3/0/7/130775474/karusedoxixoxad.pdf
    • http://dlgrestorations.net/uploads/1/3/1/4/131407539/ketadiwoweb.pdf
    • http://mx.northernlightllc.com/uploads/1/3/0/4/130435573/modaso-gozesuran-mifid.pdf
    • http://vintagecharmphotography.com/uploads/1/3/0/4/130488114/zebako.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_off00006747.bin
d55a2ae50884267888c4d538827dec823dff0fd163f2c1d78f8d8e4b77224ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6747 13080 bytes

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