Malicious PDF — malware analysis report

Static analysis result for SHA-256 272e50350b0b63d9…

MALICIOUS

PDF

32.3 KB Created: 2020-03-21 13:05:00 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a928c7aa90f71b9b2816d0328676cd4e SHA-1: f32d6c581707348a59ca5494c40ebeab18c74029 SHA-256: 272e50350b0b63d95b8b165b9857563f56e0f781ed4582025dd6f654bc52ed64
92 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF files hosted on various domains. The document body, though partially corrupted, contains references to 'Dell inspiron 530 desktop computer' and 'wkhtmltopdf', suggesting a lure to potentially malicious content disguised as product information or technical documents. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking structure.

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://rscbenches.com/uploads/1/3/0/5/130538902/130538902.html#dell+inspiron+530+desktop+computer
    • http://mworchestra.com/uploads/1/3/0/5/130546538/2629404.pdf
    • http://realliferecords.com/uploads/1/3/0/4/130489265/baxem.pdf
    • http://vt0.net/uploads/1/3/0/6/130639406/8624304.pdf
    • http://shopslapdatapp.com/uploads/1/3/0/3/130324075/851922.pdf
    • http://feedtheneedy.net/uploads/1/3/0/6/130603814/275e62e55d7d5c.pdf
    • http://simulacrator.com/uploads/1/3/0/6/130603968/9124b8.pdf
    • http://illuminatedlivingcoach.com/uploads/1/3/0/4/130483939/1176705.pdf
    • http://suprozone.net/uploads/1/3/0/6/130604777/sozirukanezefug.pdf
    • http://www.enginemedia.com.au/uploads/1/3/0/7/130739693/22b33c6e1f3.pdf
    • http://drschierling.com/uploads/1/3/0/6/130603731/f07447bd64d77.pdf
    • http://www.acupuncture-bohol.com/uploads/1/3/0/5/130545260/mivavasanetorar.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_off0000542b.bin
b3f0c9327433e6f22fdf380f678678fb037ebeb370fa9ec807cb33fbf52727c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x542B 7920 bytes

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