Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d911d75be6e1fc…

MALICIOUS

PDF

33.2 KB Created: 2020-04-04 05:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f60da50b1d489866f9b8ff905f99407 SHA-1: dc6a6b763ca098ce4e9495aa2935283ded717eda SHA-256: b9d911d75be6e1fcfc4392d243b74c9bc3b5b042ffd776376a816787d14ea9ba
94 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, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The document body, though partially corrupted, contains text related to 'Libro fundamentos de la comunicacion humana pdf' and metadata suggesting it was generated by wkhtmltopdf, which can be used to create SEO-optimized content that may serve as a lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://jamiefehr.com/uploads/1/3/0/5/130551356/130551356.html#libro+fundamentos+de+la+comunicacion+humana+pdf
    • http://mlphotoservice.com/uploads/1/3/0/3/130313200/3066865.pdf
    • http://jamesbond007band.com/uploads/1/3/0/6/130604944/1400045.pdf
    • http://orencorp.com/uploads/1/3/1/3/131379833/08f15561885.pdf
    • http://drpaigevictor.com/uploads/1/3/0/8/130813998/8550665.pdf
    • http://love42productions.com/uploads/1/3/0/6/130604405/7d58af562.pdf
    • http://my-game-info.com/uploads/1/3/0/5/130588574/rutaz.pdf
    • http://insight2empower.biz/uploads/1/3/0/6/130604519/8c4316d.pdf
    • http://stoneddreams.net/uploads/1/3/0/6/130620340/jubomamiso_nukakanidod_waxeponerejiz_xirexolizim.pdf
    • http://mksplumbingsocal.com/uploads/1/3/0/5/130589342/3d31d3f0dec.pdf
    • http://pallavikanungo.com/uploads/1/3/0/7/130776657/wikiwakimaba.pdf
    • http://tallerespiritual.com/uploads/1/3/0/6/130620897/8354434.pdf
    • http://thelollipopstop.online/uploads/1/3/0/3/130379291/dimanitibiku.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_off000057f2.bin
555a18ebf8d2e2bbd30b2aef686cecb6fbc65770644769583dc90940ac831daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F2 8080 bytes

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