Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19c66c802d513be…

MALICIOUS

PDF

37.0 KB Created: 2020-04-10 11:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4efef9da6419d83f66a14399775e5c9 SHA-1: 98b4efa429952900c31df7467b4df9d9ce4713f5 SHA-256: f19c66c802d513bef56704ec7be194f3289b86d25d217dc09cb5c9127387a9ff
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a link farm, likely to host or redirect to malicious payloads.

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://gracecartercapstone.com/uploads/1/3/0/6/130620746/130620746.html#convertidor+de+n%C3%BAmero+binario+a+octal
    • http://lojadolar.website/uploads/1/3/0/2/130272575/1208809.pdf
    • http://maquinasflexograficas.com/uploads/1/3/1/3/131398457/8663579.pdf
    • http://conejovalleylactation.com/uploads/1/3/0/7/130739396/4eba77a.pdf
    • http://lestateliving.com/uploads/1/3/0/7/130739387/5161469.pdf
    • http://devinatripbeats.com/uploads/1/3/0/9/130969597/4667734.pdf
    • http://msjpropertydevolopment.net/uploads/1/3/0/6/130639500/8c07b31a2792c.pdf
    • http://wholesalehomesflorida.com/uploads/1/3/0/6/130621446/jepuguzeboba_mefer_lapus_robuju.pdf
    • http://bpcleaningservices.com/uploads/1/3/0/7/130740502/tipilen.pdf
    • http://nudeintravel.com/uploads/1/3/0/8/130873876/gapiwetag.pdf
    • http://rmreno.com/uploads/1/3/0/6/130604093/nubibozol_botujivawu_fivutano.pdf
    • http://progressivepainting.org/uploads/1/3/1/4/131454272/falinuwibo.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_off000066ee.bin
194ff9e7e12683fa78fdd96a2d4757003a46a9d8c53a914dec46b6e8a2261bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EE 8284 bytes

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