Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c70902977d1c4d…

MALICIOUS

PDF

40.9 KB Created: 2020-03-30 07:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 008be151ed4c6c3b09155d58a30aff3a SHA-1: f677e7fc94dbecf5c6da6aea2047246906a41969 SHA-256: a8c70902977d1c4df874a7753ea5c446f5e8e28137807573297ac71045754966
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files on various domains. This pattern is indicative of SEO poisoning or a link farm used to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact lure.

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://74-123-76-23.mgwnet.com/uploads/1/3/0/6/130604597/130604597.html#teoria+del+autocuidado+concepto
    • http://tbpoetry.com/uploads/1/3/0/9/130969926/rirosoginuni.pdf
    • http://shinetogether360.org/uploads/1/3/0/7/130740297/sarujupidapes.pdf
    • http://svluckofafool.com/uploads/1/3/1/0/131070247/57b82.pdf
    • http://butleralabama.net/uploads/1/3/0/6/130621552/womuxo.pdf
    • http://infinityantiques.com/uploads/1/3/0/6/130621443/numerexenotal.pdf
    • http://irenkebstudio.com/uploads/1/3/0/5/130545537/9579376.pdf
    • http://muellersmartialarts.com/uploads/1/3/0/6/130621276/9433468.pdf
    • http://cordialkitchens.com/uploads/1/3/0/7/130740259/4564653.pdf
    • http://carlossalazarlomelin.com/uploads/1/3/0/6/130604703/429e646e.pdf
    • http://lnlcleaningservicesfl.com/uploads/1/3/0/4/130478481/aa49c.pdf
    • http://poison-sisters.com/uploads/1/3/0/6/130639251/dadajatusugepunebemo.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_off00007504.bin
673b77edc541b153f485a55af5f6a8004d0ab20c736b1f647e5c6b77c6afa266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7504 9160 bytes

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