Malicious PDF — malware analysis report

Static analysis result for SHA-256 b887191df92ea167…

MALICIOUS

PDF

32.4 KB Created: 2020-06-03 23:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7205a6767176e803762e8dd22122d53 SHA-1: b81ed38a39921c995a9c622d428274a4f6ae6f7c SHA-256: b887191df92ea1672e6eb916a4285b1226c458eca9ddac535901f0dcf6425d7d
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body also explicitly contains URLs, such as 'http://74-123-77-135.mgwnet.com/uploads/1/3/0/4/130494172/130494172.html#after+effect+classroom+in+a+book+pdf'. This suggests a phishing or content-luring attack pattern where the user is directed to external, potentially malicious, resources. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://74-123-77-135.mgwnet.com/uploads/1/3/0/4/130494172/130494172.html#after+effect+classroom+in+a+book+pdf
    • http://fivestardriveways.com/uploads/1/3/0/5/130588307/9549346.pdf
    • http://history.preswex.ie/uploads/1/3/1/6/131607005/0b1427a8.pdf
    • http://camocarriers.com/uploads/1/3/1/6/131606203/8e192c04c.pdf
    • http://74-123-77-135.mgwnet.com/uploads/1/3/0/4/130494172/terms.html
    • http://74-123-77-135.mgwnet.com/uploads/1/3/0/4/130494172/dmca.html
    • http://74-123-77-135.mgwnet.com/uploads/1/3/0/4/130494172/policy.html
    • https://duwopizemole.files.wordpress.com/2020/06/zimedirigejumok.pdf
    • https://xexufadotafu.files.wordpress.com/2020/06/66843280368.pdf
    • https://kusulubir.files.wordpress.com/2020/06/51360119821.pdf
    • https://gabufiv745489397.files.wordpress.com/2020/06/fesoropivunufo.pdf
    • https://pawelulewo.files.wordpress.com/2020/06/xumupalajomugijona.pdf
    • https://dojenus.files.wordpress.com/2020/06/24016336160.pdf
    • https://gafosabok.files.wordpress.com/2020/06/bulalevubej.pdf
    • https://kilopixari.files.wordpress.com/2020/06/58831111924.pdf
    • https://dilupojuze.files.wordpress.com/2020/06/titesileligino.pdf
    • https://xalemogewal.files.wordpress.com/2020/06/15946497382.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_off00005536.bin
f8e64efe10f95d81c8eda219d4b0ab37d75f5a131f2e8cc5c8604ead4119386d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5536 9612 bytes

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