Malicious PDF — malware analysis report

Static analysis result for SHA-256 04211e04622e7935…

MALICIOUS

PDF

40.2 KB Created: 2020-04-07 08:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 76bd985aa1948295888fa1b420275e79 SHA-1: 215800d20b4c03b5f755d3374a2f3e4935d2b3c1 SHA-256: 04211e04622e793541f7af435dda3a135c6b9795f1b6bc66e9ffa1494f528ef9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a phishing lure designed to direct users to potentially malicious content. The document body's title, 'Danza de dragones pdf descargar gratis', suggests a deceptive attempt to trick users into downloading files. No scripts were extracted, but the heuristic 'PDF_SEO_LINK_FARM' strongly suggests a malicious intent to distribute further malware or engage in phishing. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://reboundat.com/uploads/1/3/0/4/130435909/130435909.html#danza+de+dragones+pdf+descargar+gratis
    • http://hinojusu.net/uploads/1/3/0/6/130604402/koxunutumaxulodasovi.pdf
    • http://mraid.site/uploads/1/3/0/4/130490488/f39501f7afb14c.pdf
    • http://celebratesource.com/uploads/1/3/0/4/130483426/pekoro.pdf
    • http://mikeajames.com/uploads/1/3/0/8/130814055/6423654.pdf
    • http://turbodogmedia.com/uploads/1/3/0/6/130621619/7901767.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://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00007d4b.bin
0f1a8183584e00f6b68f7804171ae757c88cded3d1c725b244ae1be3cb4fc633		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7D4B 6512 bytes
font_00_sfnt_off00005ead.bin
60badf5bd4e656563c7c42380263891d22a8241f932e5deb0b49332c878b5104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAD 8412 bytes

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