Malicious PDF — malware analysis report

Static analysis result for SHA-256 1734c71bfbbac4d7…

MALICIOUS

PDF

31.3 KB Created: 2020-06-08 06:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71b1e232ef144eb0fc8322533d5a8c7b SHA-1: 232823bda9078808920f366ca76644d1132ef561 SHA-256: 1734c71bfbbac4d7ba7c242fdd174aaef095dfdfd130c4642d790e8fa3d8585c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was generated by wkhtmltopdf and contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files and HTML pages hosted on different domains. The ML classifier also flagged this PDF as malicious. The primary attack pattern appears to be a link farm designed to direct users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://matematica.ca/uploads/1/3/0/6/130639209/130639209.html#edebiyat+soru+bankas%25C4%25B1+limit
    • http://partyanimalphotography.com/uploads/1/3/1/6/131606881/pifepamilonib.pdf
    • http://mytimemassaggi.com/uploads/1/3/0/5/130541944/7772071.pdf
    • http://miltonrtrice.com/uploads/1/3/0/5/130588596/db6563c6b.pdf
    • http://lornastyle.com/uploads/1/3/0/4/130476066/nusanukux.pdf
    • http://physiochannel.org/uploads/1/3/0/5/130540714/nufuju.pdf
    • http://mail.bafustago.com/uploads/1/3/0/8/130874680/xexotixunafut-wofavomon-gobotipu-doxonazogos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://mumomajolope.files.wordpress.com/2020/06/48934037661.pdf
    • https://lejameg514837591.files.wordpress.com/2020/06/98133301729.pdf
    • https://jaxufuli.files.wordpress.com/2020/06/mumutinomaj.pdf
    • https://kotosidimof.files.wordpress.com/2020/06/xeworarabuxefubudebajabok.pdf
    • https://joselolede.files.wordpress.com/2020/06/vomojogigosigizawo.pdf
    • https://nizulaxowamo181495606.files.wordpress.com/2020/06/jesevusobapegogem.pdf
    • https://wekujepomope.files.wordpress.com/2020/06/80844861359.pdf
    • https://kogezes.files.wordpress.com/2020/06/90646179801.pdf
    • https://toposimijiv.files.wordpress.com/2020/06/66155037663.pdf
    • https://litowelixi.files.wordpress.com/2020/06/35275303364.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ecd.bin
c2593e11816bc73973726368502726879df9202bf2e77811a071e1343c632c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ECD 10352 bytes

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