Malicious PDF — malware analysis report

Static analysis result for SHA-256 b034fc51feee3597…

MALICIOUS

PDF

49.5 KB Created: 2020-04-02 01:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a48dd7bb1aeb1495f5a022be8075d495 SHA-1: e91edc1417263aaface36e550ff34c59a4e6d285 SHA-256: b034fc51feee35973aaba6f396ca1ad42dc24954dda7b1fad6f2ba877dfbdc45
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body contains text related to business administration and mentions the wkhtmltopdf tool, suggesting it might be generated content. The primary attack pattern involves redirecting users to a network of linked PDF files, likely for SEO spam or to host further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://bestnecessities.com/uploads/1/3/0/3/130323181/130323181.html#la+carrera+de+administracion+de+empresas+es+bien+pagada
    • http://mtlbbstatsboys5a.com/uploads/1/3/1/1/131163890/texowarapebosa_gazakigub.pdf
    • http://mydiamondmakers.com/uploads/1/3/1/3/131383657/fixexi.pdf
    • http://woodstockvintage.org/uploads/1/3/1/4/131454151/makonenasoji-mozilupunaluf.pdf
    • http://topqualityaudio.com/uploads/1/3/0/9/130969354/4560093.pdf
    • http://thehealinghandscenter.com/uploads/1/3/0/9/130970015/rijuxemow-zeligoju-wakuxe.pdf
    • http://nationalbusinesseducationweek.com/uploads/1/3/0/3/130323603/19483.pdf
    • http://ckinsuranceoptions.com/uploads/1/3/0/9/130969140/sijilufil.pdf
    • http://tri-citymutulwatercompany.com/uploads/1/3/0/4/130489363/7880738.pdf
    • http://roswellmedspa.com/uploads/1/3/0/9/130969373/12ec05d54.pdf
    • http://franceinthespring.com/uploads/1/3/0/7/130775282/1634080.pdf
    • http://realityrenee.com/uploads/1/3/0/7/130739474/witidawe.pdf
    • http://musicanddancecolumbia.net/uploads/1/3/0/5/130540246/tekelas.pdf
    • http://aberdeenmortgagegroup.com/uploads/1/3/1/4/131453006/sepijutanasana_rarupivefepe.pdf
    • http://storiesforsummer.org/uploads/1/3/0/5/130539255/5ecaaf1624b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b6e.bin
ad0e66bdf01f0f6fd81c81e239bf30002df4f2d7755e0d5e1e84b7ae0d3315ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6E 9296 bytes
font_01_sfnt_off0000ad27.bin
8b49b898eeeb55350302230a0aef0e3fe581ebebceebb0d2663ff9d210fc83c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD27 2600 bytes

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