Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c39428ac70461f1…

MALICIOUS

PDF

37.2 KB Created: 2020-03-29 05:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: af06f56ca1db639e2801abf08be0c9f0 SHA-1: cc1c07948536f2caeaab7ee30c56b2e6a71a00e8 SHA-256: 5c39428ac70461f13a83d03f155528f401a9ef38dab3560c63db5684da52d682
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to potentially harmful content, possibly leveraging embedded JavaScript within the PDF structure.

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://sta-66-99-58-206.ladse.org/uploads/1/3/1/4/131437394/131437394.html#proyecto+factible+definicion+y+caracteristicas
    • http://clearwaterconcerts.org/uploads/1/3/0/8/130873975/xalumifotesavatewomo.pdf
    • http://pakfitness.ca/uploads/1/3/0/7/130739086/vewas.pdf
    • http://www.savponline.com/uploads/1/3/0/9/130969824/8491066.pdf
    • http://trafalgarpartner.com/uploads/1/3/0/5/130539881/vujutufu.pdf
    • http://athleticdrama.com/uploads/1/3/0/4/130476208/4961531.pdf
    • http://ultimatecustomecabinets.com/uploads/1/3/1/4/131408397/9858468.pdf
    • http://www.contemporarymusicproject.org/uploads/1/3/0/8/130874474/7225206.pdf
    • http://eenloseindje.nl/uploads/1/3/0/3/130313186/215435.pdf
    • http://princewindsor.com/uploads/1/3/0/5/130551864/b806a65.pdf
    • http://eigolessons.com/uploads/1/3/0/3/130323162/a5e82d97339cf33.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_off000066ba.bin
a2dd3b98e8117aa75da68637c5e0d3b90e763f901a036b41849c159ee90195e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BA 8500 bytes

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