Malicious PDF — malware analysis report

Static analysis result for SHA-256 d228518a891e7e68…

MALICIOUS

PDF

52.0 KB Created: 2020-03-29 23:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 04b94ac7d2cb80685c6f2aef37c30735 SHA-1: da23cd0d820af1e198937cdcfe8184d1788e7670 SHA-256: d228518a891e7e6801b1f301c1084d7fd2698e8e393cafb7439a35c1de7c5f44
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files on various domains. This indicates a link farm or redirection strategy designed to obscure the ultimate destination or to distribute malicious content across multiple compromised sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://74-123-77-236.mgwnet.com/uploads/1/3/1/4/131453747/131453747.html#angulo+de+la+circunferencia+ejercicios+resueltos
    • http://babysittersareus.com/uploads/1/3/0/7/130776756/tuwutilunojinu.pdf
    • http://adamdavisracing.com/uploads/1/3/0/3/130323603/zodogi.pdf
    • http://bibleworld.us/uploads/1/3/0/6/130604127/5a227b48d05c1e.pdf
    • http://piedrasvivasiglesia.org/uploads/1/3/0/6/130603946/fd7e9fc47756.pdf
    • http://aalaos.org/uploads/1/3/0/4/130488565/9713592.pdf
    • http://dennyhomes.com/uploads/1/3/0/8/130874338/6691961.pdf
    • http://life9rescue.org/uploads/1/3/0/9/130969811/8595783.pdf
    • http://securitycitizen.com/uploads/1/3/0/6/130621264/6bcd14.pdf
    • http://number120designs.com/uploads/1/3/0/9/130969060/manalomopovodefakome.pdf
    • http://arttreeservicellc.com/uploads/1/3/0/3/130313159/gezote.pdf
    • http://genesisstudios.co/uploads/1/3/0/8/130813509/betig.pdf
    • http://yuleecbd.com/uploads/1/3/0/8/130813510/dd847a6906.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000738f.bin
6ea75d4903eac3d7c3c35a3517ba79b0ce9106be55f665a5aef0f6d4708e2118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738F 1988 bytes
font_01_sfnt_off00007ca8.bin
436317c89e3a78820d326676cbc41685eec64f6f314920fd51051c3af0d6b67e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA8 9640 bytes
font_02_sfnt_off00009f3e.bin
b904df2f19b73e9cc5d669ee10dd139b3936a1ce982f5acfd4ad96d1b5587a19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F3E 3060 bytes
font_03_sfnt_off0000aa02.bin
e9c6780662d91286d35f0805a6df58f13e266b432bd16b5234bfbae6fb933ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA02 16268 bytes

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