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) First seen: 2020-09-24
MD5: a48dd7bb1aeb1495f5a022be8075d495 SHA-1: e91edc1417263aaface36e550ff34c59a4e6d285 SHA-256: b034fc51feee35973aaba6f396ca1ad42dc24954dda7b1fad6f2ba877dfbdc45
96 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 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://bestnecessities.com/uploads/1/3/0/3/130323181/130323181.html#la+carrera+de+administracion+de+empresas+es+bien+pagada PDF link annotation
    • http://mtlbbstatsboys5a.com/uploads/1/3/1/1/131163890/texowarapebosa_gazakigub.pdfIn PDF document text
    • http://mydiamondmakers.com/uploads/1/3/1/3/131383657/fixexi.pdfIn PDF document text
    • http://woodstockvintage.org/uploads/1/3/1/4/131454151/makonenasoji-mozilupunaluf.pdfIn PDF document text
    • http://topqualityaudio.com/uploads/1/3/0/9/130969354/4560093.pdfIn PDF document text
    • http://thehealinghandscenter.com/uploads/1/3/0/9/130970015/rijuxemow-zeligoju-wakuxe.pdfIn PDF document text
    • http://nationalbusinesseducationweek.com/uploads/1/3/0/3/130323603/19483.pdfIn PDF document text
    • http://ckinsuranceoptions.com/uploads/1/3/0/9/130969140/sijilufil.pdfIn PDF document text
    • http://tri-citymutulwatercompany.com/uploads/1/3/0/4/130489363/7880738.pdfIn PDF document text
    • http://roswellmedspa.com/uploads/1/3/0/9/130969373/12ec05d54.pdfIn PDF document text
    • http://franceinthespring.com/uploads/1/3/0/7/130775282/1634080.pdfIn PDF document text
    • http://realityrenee.com/uploads/1/3/0/7/130739474/witidawe.pdfIn PDF document text
    • http://musicanddancecolumbia.net/uploads/1/3/0/5/130540246/tekelas.pdfIn PDF document text
    • http://aberdeenmortgagegroup.com/uploads/1/3/1/4/131453006/sepijutanasana_rarupivefepe.pdfIn PDF document text
    • http://storiesforsummer.org/uploads/1/3/0/5/130539255/5ecaaf1624b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6E 9296 bytes
SHA-256: ad0e66bdf01f0f6fd81c81e239bf30002df4f2d7755e0d5e1e84b7ae0d3315ad
font_01_sfnt_off0000ad27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD27 2600 bytes
SHA-256: 8b49b898eeeb55350302230a0aef0e3fe581ebebceebb0d2663ff9d210fc83c8

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