Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c99769c5eb3050e…

MALICIOUS

PDF

40.0 KB Created: 2020-06-10 13:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7e715828681cef2b538ccf871691623 SHA-1: 27793d0576095c5af8ffd299085a8b45f546b44f SHA-256: 9c99769c5eb3050eb45d6b52739ba419b8e96919f0a2b2ca0f8cedf6720b0d80
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, http://sfpbfun.com/uploads/1/3/0/6/130604542/130604542.html#distribui%25C3%25A7%25C3%25A3o+eletronica+em+camadas+exercicios+9+ano, is directly embedded in the document body. The ML classifier also strongly indicated maliciousness. The overall pattern suggests a link farm or redirection scheme designed to lead users to potentially harmful content.

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://sfpbfun.com/uploads/1/3/0/6/130604542/130604542.html#distribui%25C3%25A7%25C3%25A3o+eletronica+em+camadas+exercicios+9+ano
    • http://markroselaw.com/uploads/1/3/0/5/130551249/wowufinozerubopoj.pdf
    • http://feministeconomy.com/uploads/1/3/1/6/131637953/96a53b0e1decf03.pdf
    • http://diamondgirlsonline.com/uploads/1/3/0/2/130272291/jogutafogexigomo.pdf
    • http://bigbenrock.com/uploads/1/3/0/6/130621240/7f6345243cb.pdf
    • http://wearecvsta.net/uploads/1/3/0/5/130545185/837445.pdf
    • http://wendyguindi.com/uploads/1/3/0/6/130639239/4169095.pdf
    • http://scottfurrer.com/uploads/1/3/0/5/130588203/zopadexab_mepijiteroxijo.pdf
    • http://holidaystaycleaning.com.au/uploads/1/3/1/3/131380066/lebosogi.pdf
    • https://jejasefepu.files.wordpress.com/2020/06/99155439206.pdf
    • https://sigegajif.files.wordpress.com/2020/06/42881969816.pdf
    • https://rivigan.files.wordpress.com/2020/06/segiviwilusiru.pdf
    • https://badodisorel.files.wordpress.com/2020/06/taxavabujerofiji.pdf
    • https://rejexurubik.files.wordpress.com/2020/06/30128230892.pdf
    • https://sokoson.files.wordpress.com/2020/06/29603958827.pdf
    • https://bageredo.files.wordpress.com/2020/06/88572715299.pdf
    • https://fumupidix.files.wordpress.com/2020/06/nesewururimora.pdf
    • https://bujamabak.files.wordpress.com/2020/06/vulibomigiliredimawesopu.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_off00006a18.bin
ca0613d418abe89832dc2f1c2fa6fce412ad4f2ca2adab4a80f0a2070e7d1c40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A18 12976 bytes

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